./chc-comp-wrapper.sh ../../../chc-comp24-benchmarks/LIA-Arrays/chc-comp24-LIA-Arrays-089.smt2 .


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This is Ultimate 0.3.0-dev-42d8767-m
[2025-04-28 21:21:50,401 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2025-04-28 21:21:50,467 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f864b0cb-d0cc-4bc7-99cd-98aa02b557f3/chc-comp25-scripts/participants/UltimateUnihorn/./chccomp-Unihorn_Default.epf
[2025-04-28 21:21:50,472 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2025-04-28 21:21:50,472 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2025-04-28 21:21:50,500 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2025-04-28 21:21:50,500 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2025-04-28 21:21:50,501 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2025-04-28 21:21:50,501 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2025-04-28 21:21:50,501 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2025-04-28 21:21:50,501 INFO  L151        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2025-04-28 21:21:50,501 INFO  L153        SettingsManager]:  * Create parallel compositions if possible=false
[2025-04-28 21:21:50,502 INFO  L153        SettingsManager]:  * Use SBE=true
[2025-04-28 21:21:50,502 INFO  L151        SettingsManager]: Preferences of ChcToBoogie differ from their defaults:
[2025-04-28 21:21:50,502 INFO  L153        SettingsManager]:  * Use one large procedure with gotos to replace tail recursive calls=false
[2025-04-28 21:21:50,502 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2025-04-28 21:21:50,502 INFO  L153        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2025-04-28 21:21:50,502 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2025-04-28 21:21:50,502 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:50,503 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2025-04-28 21:21:50,503 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2025-04-28 21:21:50,503 INFO  L153        SettingsManager]:  * Trace refinement strategy=CAMEL
[2025-04-28 21:21:50,503 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2025-04-28 21:21:50,503 INFO  L153        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2025-04-28 21:21:50,503 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2025-04-28 21:21:50,504 INFO  L151        SettingsManager]: Preferences of SmtParser differ from their defaults:
[2025-04-28 21:21:50,504 INFO  L153        SettingsManager]:  * SmtParser Mode=UltimateTreeAutomizer
[2025-04-28 21:21:50,843 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2025-04-28 21:21:50,856 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2025-04-28 21:21:50,859 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2025-04-28 21:21:50,861 INFO  L270        PluginConnector]: Initializing SmtParser...
[2025-04-28 21:21:50,862 INFO  L274        PluginConnector]: SmtParser initialized
[2025-04-28 21:21:50,863 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f864b0cb-d0cc-4bc7-99cd-98aa02b557f3/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA-Arrays/chc-comp24-LIA-Arrays-089.smt2
[2025-04-28 21:21:50,866 INFO  L314              SmtParser]: Parsing .smt2 file as a set of Horn Clauses
[2025-04-28 21:21:50,869 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
unknown
[2025-04-28 21:21:51,459 INFO  L339              SmtParser]: Successfully executed SMT file /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f864b0cb-d0cc-4bc7-99cd-98aa02b557f3/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA-Arrays/chc-comp24-LIA-Arrays-089.smt2
[2025-04-28 21:21:51,462 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2025-04-28 21:21:51,465 INFO  L133        ToolchainWalker]: Walking toolchain with 4 elements.
[2025-04-28 21:21:51,466 INFO  L112        PluginConnector]: ------------------------ChcToBoogie----------------------------
[2025-04-28 21:21:51,466 INFO  L270        PluginConnector]: Initializing ChcToBoogie...
[2025-04-28 21:21:51,467 INFO  L274        PluginConnector]: ChcToBoogie initialized
[2025-04-28 21:21:51,470 INFO  L184        PluginConnector]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,533 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51 Unit
[2025-04-28 21:21:51,533 INFO  L131        PluginConnector]: ------------------------ END ChcToBoogie----------------------------
[2025-04-28 21:21:51,536 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2025-04-28 21:21:51,536 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2025-04-28 21:21:51,536 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2025-04-28 21:21:51,556 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,556 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,609 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,611 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,627 INFO  L184        PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,632 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,635 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,644 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,646 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,680 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2025-04-28 21:21:51,685 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2025-04-28 21:21:51,685 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2025-04-28 21:21:51,685 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2025-04-28 21:21:51,686 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (1/1) ...
[2025-04-28 21:21:51,694 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:51,714 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:51,728 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /usr/bin/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2025-04-28 21:21:51,733 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2025-04-28 21:21:51,748 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure False given in one single declaration
[2025-04-28 21:21:51,748 INFO  L130     BoogieDeclarations]: Found specification of procedure False
[2025-04-28 21:21:51,748 INFO  L138     BoogieDeclarations]: Found implementation of procedure False
[2025-04-28 21:21:51,748 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure realizable given in one single declaration
[2025-04-28 21:21:51,748 INFO  L130     BoogieDeclarations]: Found specification of procedure realizable
[2025-04-28 21:21:51,748 INFO  L138     BoogieDeclarations]: Found implementation of procedure realizable
[2025-04-28 21:21:51,749 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcStart__syn given in one single declaration
[2025-04-28 21:21:51,749 INFO  L130     BoogieDeclarations]: Found specification of procedure funcStart__syn
[2025-04-28 21:21:51,749 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcStart__syn
[2025-04-28 21:21:51,749 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcStart__sem given in one single declaration
[2025-04-28 21:21:51,749 INFO  L130     BoogieDeclarations]: Found specification of procedure funcStart__sem
[2025-04-28 21:21:51,750 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcStart__sem
[2025-04-28 21:21:51,750 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcS__sem given in one single declaration
[2025-04-28 21:21:51,750 INFO  L130     BoogieDeclarations]: Found specification of procedure funcS__sem
[2025-04-28 21:21:51,750 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcS__sem
[2025-04-28 21:21:51,750 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcA__sem given in one single declaration
[2025-04-28 21:21:51,750 INFO  L130     BoogieDeclarations]: Found specification of procedure funcA__sem
[2025-04-28 21:21:51,750 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcA__sem
[2025-04-28 21:21:51,752 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcE__sem given in one single declaration
[2025-04-28 21:21:51,752 INFO  L130     BoogieDeclarations]: Found specification of procedure funcE__sem
[2025-04-28 21:21:51,752 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcE__sem
[2025-04-28 21:21:51,752 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcB__sem given in one single declaration
[2025-04-28 21:21:51,753 INFO  L130     BoogieDeclarations]: Found specification of procedure funcB__sem
[2025-04-28 21:21:51,753 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcB__sem
[2025-04-28 21:21:51,753 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcB__syn given in one single declaration
[2025-04-28 21:21:51,753 INFO  L130     BoogieDeclarations]: Found specification of procedure funcB__syn
[2025-04-28 21:21:51,753 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcB__syn
[2025-04-28 21:21:51,753 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcA__syn given in one single declaration
[2025-04-28 21:21:51,753 INFO  L130     BoogieDeclarations]: Found specification of procedure funcA__syn
[2025-04-28 21:21:51,753 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcA__syn
[2025-04-28 21:21:51,753 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcS__syn given in one single declaration
[2025-04-28 21:21:51,753 INFO  L130     BoogieDeclarations]: Found specification of procedure funcS__syn
[2025-04-28 21:21:51,754 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcS__syn
[2025-04-28 21:21:51,754 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcE__syn given in one single declaration
[2025-04-28 21:21:51,754 INFO  L130     BoogieDeclarations]: Found specification of procedure funcE__syn
[2025-04-28 21:21:51,754 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcE__syn
[2025-04-28 21:21:51,754 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure Ultimate.START given in one single declaration
[2025-04-28 21:21:51,754 INFO  L130     BoogieDeclarations]: Found specification of procedure Ultimate.START
[2025-04-28 21:21:51,755 INFO  L138     BoogieDeclarations]: Found implementation of procedure Ultimate.START
[2025-04-28 21:21:51,996 INFO  L234             CfgBuilder]: Building ICFG
[2025-04-28 21:21:51,998 INFO  L260             CfgBuilder]: Building CFG for each procedure with an implementation
[2025-04-28 21:21:52,547 INFO  L?                        ?]: Removed 146 outVars from TransFormulas that were not future-live.
[2025-04-28 21:21:52,547 INFO  L283             CfgBuilder]: Performing block encoding
[2025-04-28 21:21:52,570 INFO  L304             CfgBuilder]: Using library mode
[2025-04-28 21:21:52,570 INFO  L312             CfgBuilder]: Removed 1 assume(true) statements.
[2025-04-28 21:21:52,571 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:52 BoogieIcfgContainer
[2025-04-28 21:21:52,571 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2025-04-28 21:21:52,575 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2025-04-28 21:21:52,575 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2025-04-28 21:21:52,579 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2025-04-28 21:21:52,580 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:51" (1/3) ...
[2025-04-28 21:21:52,581 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c1bdc70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 28.04 09:21:52, skipping insertion in model container
[2025-04-28 21:21:52,581 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:51" (2/3) ...
[2025-04-28 21:21:52,581 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c1bdc70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.04 09:21:52, skipping insertion in model container
[2025-04-28 21:21:52,581 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:52" (3/3) ...
[2025-04-28 21:21:52,584 INFO  L128   eAbstractionObserver]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver
[2025-04-28 21:21:52,602 INFO  L217   ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2025-04-28 21:21:52,606 INFO  L151   ceAbstractionStarter]: Applying trace abstraction to ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver that has 13 procedures, 74 locations, 150 edges, 13 initial locations, 0 loop locations, and 1 error locations.
[2025-04-28 21:21:52,664 INFO  L339      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2025-04-28 21:21:52,681 INFO  L340      AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=None, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1ccb7ae6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2025-04-28 21:21:52,681 INFO  L341      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2025-04-28 21:21:52,688 INFO  L278                IsEmpty]: Start isEmpty. Operand  has 74 states, 25 states have (on average 1.8) internal successors, (45), 37 states have internal predecessors, (45), 35 states have call successors, (35), 12 states have call predecessors, (35), 12 states have return successors, (35), 25 states have call predecessors, (35), 35 states have call successors, (35)
[2025-04-28 21:21:52,705 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2025-04-28 21:21:52,706 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:52,706 INFO  L218           NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:52,707 INFO  L403      AbstractCegarLoop]: === Iteration 1 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:52,745 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:52,746 INFO  L85        PathProgramCache]: Analyzing trace with hash 1388218076, now seen corresponding path program 1 times
[2025-04-28 21:21:52,752 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:52,753 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811292716]
[2025-04-28 21:21:52,753 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:52,754 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:52,841 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 44 statements into 1 equivalence classes.
[2025-04-28 21:21:53,026 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 44 of 44 statements.
[2025-04-28 21:21:53,026 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:53,027 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:54,253 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked.
[2025-04-28 21:21:54,254 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:54,254 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811292716]
[2025-04-28 21:21:54,255 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811292716] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:54,255 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:54,260 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7
[2025-04-28 21:21:54,264 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981597041]
[2025-04-28 21:21:54,265 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:54,269 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2025-04-28 21:21:54,270 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:54,340 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2025-04-28 21:21:54,345 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2025-04-28 21:21:54,347 INFO  L87              Difference]: Start difference. First operand  has 74 states, 25 states have (on average 1.8) internal successors, (45), 37 states have internal predecessors, (45), 35 states have call successors, (35), 12 states have call predecessors, (35), 12 states have return successors, (35), 25 states have call predecessors, (35), 35 states have call successors, (35) Second operand  has 7 states, 4 states have (on average 4.0) internal successors, (16), 6 states have internal predecessors, (16), 4 states have call successors, (11), 1 states have call predecessors, (11), 4 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11)
[2025-04-28 21:21:54,721 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:54,722 INFO  L93              Difference]: Finished difference Result 76 states and 117 transitions.
[2025-04-28 21:21:54,723 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2025-04-28 21:21:54,725 INFO  L79                 Accepts]: Start accepts. Automaton has  has 7 states, 4 states have (on average 4.0) internal successors, (16), 6 states have internal predecessors, (16), 4 states have call successors, (11), 1 states have call predecessors, (11), 4 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) Word has length 44
[2025-04-28 21:21:54,725 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:54,738 INFO  L225             Difference]: With dead ends: 76
[2025-04-28 21:21:54,738 INFO  L226             Difference]: Without dead ends: 74
[2025-04-28 21:21:54,743 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56
[2025-04-28 21:21:54,746 INFO  L437           NwaCegarLoop]: 110 mSDtfsCounter, 3 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 640 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:54,747 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 640 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:54,761 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 74 states.
[2025-04-28 21:21:54,795 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74.
[2025-04-28 21:21:54,797 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 74 states, 25 states have (on average 1.76) internal successors, (44), 36 states have internal predecessors, (44), 35 states have call successors, (35), 12 states have call predecessors, (35), 13 states have return successors, (36), 25 states have call predecessors, (36), 35 states have call successors, (36)
[2025-04-28 21:21:54,805 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 115 transitions.
[2025-04-28 21:21:54,806 INFO  L79                 Accepts]: Start accepts. Automaton has 74 states and 115 transitions. Word has length 44
[2025-04-28 21:21:54,809 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:54,809 INFO  L485      AbstractCegarLoop]: Abstraction has 74 states and 115 transitions.
[2025-04-28 21:21:54,809 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 4 states have (on average 4.0) internal successors, (16), 6 states have internal predecessors, (16), 4 states have call successors, (11), 1 states have call predecessors, (11), 4 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11)
[2025-04-28 21:21:54,810 INFO  L278                IsEmpty]: Start isEmpty. Operand 74 states and 115 transitions.
[2025-04-28 21:21:54,814 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 77
[2025-04-28 21:21:54,817 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:54,818 INFO  L218           NwaCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:54,818 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2025-04-28 21:21:54,818 INFO  L403      AbstractCegarLoop]: === Iteration 2 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:54,819 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:54,819 INFO  L85        PathProgramCache]: Analyzing trace with hash -1780724259, now seen corresponding path program 1 times
[2025-04-28 21:21:54,819 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:54,819 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128781047]
[2025-04-28 21:21:54,819 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:54,819 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:54,896 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 76 statements into 1 equivalence classes.
[2025-04-28 21:21:54,997 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:21:54,998 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:54,998 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:55,953 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked.
[2025-04-28 21:21:55,954 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:55,954 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128781047]
[2025-04-28 21:21:55,954 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128781047] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:55,954 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897069267]
[2025-04-28 21:21:55,954 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:55,954 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:55,959 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:55,964 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:55,967 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2025-04-28 21:21:56,269 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 76 statements into 1 equivalence classes.
[2025-04-28 21:21:56,521 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:21:56,521 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:56,521 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:56,529 INFO  L256         TraceCheckSpWp]: Trace formula consists of 1226 conjuncts, 11 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:56,538 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:56,895 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked.
[2025-04-28 21:21:56,898 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:58,110 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked.
[2025-04-28 21:21:58,110 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [897069267] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:58,110 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:58,110 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20
[2025-04-28 21:21:58,111 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559315934]
[2025-04-28 21:21:58,111 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:58,113 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 20 states
[2025-04-28 21:21:58,114 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:58,115 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants.
[2025-04-28 21:21:58,116 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380
[2025-04-28 21:21:58,116 INFO  L87              Difference]: Start difference. First operand 74 states and 115 transitions. Second operand  has 20 states, 10 states have (on average 4.0) internal successors, (40), 18 states have internal predecessors, (40), 13 states have call successors, (27), 1 states have call predecessors, (27), 10 states have return successors, (27), 10 states have call predecessors, (27), 13 states have call successors, (27)
[2025-04-28 21:21:58,709 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:58,710 INFO  L93              Difference]: Finished difference Result 86 states and 142 transitions.
[2025-04-28 21:21:58,714 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2025-04-28 21:21:58,715 INFO  L79                 Accepts]: Start accepts. Automaton has  has 20 states, 10 states have (on average 4.0) internal successors, (40), 18 states have internal predecessors, (40), 13 states have call successors, (27), 1 states have call predecessors, (27), 10 states have return successors, (27), 10 states have call predecessors, (27), 13 states have call successors, (27) Word has length 76
[2025-04-28 21:21:58,715 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:58,718 INFO  L225             Difference]: With dead ends: 86
[2025-04-28 21:21:58,718 INFO  L226             Difference]: Without dead ends: 81
[2025-04-28 21:21:58,722 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 141 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756
[2025-04-28 21:21:58,723 INFO  L437           NwaCegarLoop]: 106 mSDtfsCounter, 10 mSDsluCounter, 1508 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 1614 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:58,723 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 1614 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2025-04-28 21:21:58,724 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 81 states.
[2025-04-28 21:21:58,747 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79.
[2025-04-28 21:21:58,747 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 79 states, 27 states have (on average 1.7037037037037037) internal successors, (46), 40 states have internal predecessors, (46), 36 states have call successors, (36), 12 states have call predecessors, (36), 15 states have return successors, (52), 26 states have call predecessors, (52), 36 states have call successors, (52)
[2025-04-28 21:21:58,752 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 134 transitions.
[2025-04-28 21:21:58,752 INFO  L79                 Accepts]: Start accepts. Automaton has 79 states and 134 transitions. Word has length 76
[2025-04-28 21:21:58,756 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:58,756 INFO  L485      AbstractCegarLoop]: Abstraction has 79 states and 134 transitions.
[2025-04-28 21:21:58,757 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 20 states, 10 states have (on average 4.0) internal successors, (40), 18 states have internal predecessors, (40), 13 states have call successors, (27), 1 states have call predecessors, (27), 10 states have return successors, (27), 10 states have call predecessors, (27), 13 states have call successors, (27)
[2025-04-28 21:21:58,757 INFO  L278                IsEmpty]: Start isEmpty. Operand 79 states and 134 transitions.
[2025-04-28 21:21:58,760 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 77
[2025-04-28 21:21:58,763 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:58,763 INFO  L218           NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:58,769 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0
[2025-04-28 21:21:58,965 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:58,965 INFO  L403      AbstractCegarLoop]: === Iteration 3 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:58,966 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:58,966 INFO  L85        PathProgramCache]: Analyzing trace with hash 1407730512, now seen corresponding path program 1 times
[2025-04-28 21:21:58,966 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:58,966 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27856082]
[2025-04-28 21:21:58,966 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:58,966 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:59,014 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 76 statements into 1 equivalence classes.
[2025-04-28 21:21:59,114 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:21:59,115 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:59,115 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:00,282 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked.
[2025-04-28 21:22:00,282 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:22:00,282 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27856082]
[2025-04-28 21:22:00,282 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27856082] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:22:00,282 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788471232]
[2025-04-28 21:22:00,282 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:22:00,282 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:00,286 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:22:00,288 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:22:00,293 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2025-04-28 21:22:00,528 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 76 statements into 1 equivalence classes.
[2025-04-28 21:22:00,728 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:22:00,729 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:22:00,729 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:00,735 INFO  L256         TraceCheckSpWp]: Trace formula consists of 1226 conjuncts, 28 conjuncts are in the unsatisfiable core
[2025-04-28 21:22:00,740 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:22:01,548 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked.
[2025-04-28 21:22:01,548 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:22:05,354 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked.
[2025-04-28 21:22:05,354 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788471232] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:22:05,354 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:22:05,354 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16] total 33
[2025-04-28 21:22:05,354 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705463535]
[2025-04-28 21:22:05,354 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:22:05,356 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 33 states
[2025-04-28 21:22:05,356 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:22:05,357 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants.
[2025-04-28 21:22:05,358 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=967, Unknown=0, NotChecked=0, Total=1056
[2025-04-28 21:22:05,358 INFO  L87              Difference]: Start difference. First operand 79 states and 134 transitions. Second operand  has 33 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 25 states have internal predecessors, (48), 24 states have call successors, (36), 1 states have call predecessors, (36), 14 states have return successors, (36), 17 states have call predecessors, (36), 24 states have call successors, (36)
[2025-04-28 21:22:07,141 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:22:07,141 INFO  L93              Difference]: Finished difference Result 103 states and 178 transitions.
[2025-04-28 21:22:07,141 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. 
[2025-04-28 21:22:07,142 INFO  L79                 Accepts]: Start accepts. Automaton has  has 33 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 25 states have internal predecessors, (48), 24 states have call successors, (36), 1 states have call predecessors, (36), 14 states have return successors, (36), 17 states have call predecessors, (36), 24 states have call successors, (36) Word has length 76
[2025-04-28 21:22:07,142 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:22:07,144 INFO  L225             Difference]: With dead ends: 103
[2025-04-28 21:22:07,144 INFO  L226             Difference]: Without dead ends: 99
[2025-04-28 21:22:07,146 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 127 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=193, Invalid=1787, Unknown=0, NotChecked=0, Total=1980
[2025-04-28 21:22:07,146 INFO  L437           NwaCegarLoop]: 106 mSDtfsCounter, 18 mSDsluCounter, 2378 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 2484 SdHoareTripleChecker+Invalid, 862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time
[2025-04-28 21:22:07,147 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 2484 Invalid, 862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time]
[2025-04-28 21:22:07,148 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 99 states.
[2025-04-28 21:22:07,173 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 87.
[2025-04-28 21:22:07,174 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 87 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 42 states have internal predecessors, (48), 40 states have call successors, (40), 12 states have call predecessors, (40), 17 states have return successors, (61), 32 states have call predecessors, (61), 40 states have call successors, (61)
[2025-04-28 21:22:07,176 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 149 transitions.
[2025-04-28 21:22:07,177 INFO  L79                 Accepts]: Start accepts. Automaton has 87 states and 149 transitions. Word has length 76
[2025-04-28 21:22:07,178 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:22:07,178 INFO  L485      AbstractCegarLoop]: Abstraction has 87 states and 149 transitions.
[2025-04-28 21:22:07,178 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 33 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 25 states have internal predecessors, (48), 24 states have call successors, (36), 1 states have call predecessors, (36), 14 states have return successors, (36), 17 states have call predecessors, (36), 24 states have call successors, (36)
[2025-04-28 21:22:07,178 INFO  L278                IsEmpty]: Start isEmpty. Operand 87 states and 149 transitions.
[2025-04-28 21:22:07,184 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 77
[2025-04-28 21:22:07,184 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:22:07,184 INFO  L218           NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:22:07,189 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2025-04-28 21:22:07,385 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:07,385 INFO  L403      AbstractCegarLoop]: === Iteration 4 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:22:07,385 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:22:07,386 INFO  L85        PathProgramCache]: Analyzing trace with hash 1825010603, now seen corresponding path program 1 times
[2025-04-28 21:22:07,386 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:22:07,386 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606349557]
[2025-04-28 21:22:07,386 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:22:07,386 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:22:07,419 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 76 statements into 1 equivalence classes.
[2025-04-28 21:22:07,458 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:22:07,458 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:22:07,458 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:08,850 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked.
[2025-04-28 21:22:08,851 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:22:08,851 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606349557]
[2025-04-28 21:22:08,851 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606349557] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:22:08,851 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666347260]
[2025-04-28 21:22:08,851 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:22:08,854 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:08,857 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:22:08,859 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:22:08,863 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2025-04-28 21:22:09,114 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 76 statements into 1 equivalence classes.
[2025-04-28 21:22:09,295 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:22:09,295 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:22:09,295 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:09,302 INFO  L256         TraceCheckSpWp]: Trace formula consists of 1226 conjuncts, 33 conjuncts are in the unsatisfiable core
[2025-04-28 21:22:09,308 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:22:10,303 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked.
[2025-04-28 21:22:10,303 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:22:15,703 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked.
[2025-04-28 21:22:15,704 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666347260] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:22:15,704 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:22:15,704 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 21] total 47
[2025-04-28 21:22:15,704 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157478491]
[2025-04-28 21:22:15,704 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:22:15,705 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 47 states
[2025-04-28 21:22:15,705 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:22:15,706 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants.
[2025-04-28 21:22:15,707 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162
[2025-04-28 21:22:15,708 INFO  L87              Difference]: Start difference. First operand 87 states and 149 transitions. Second operand  has 47 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 36 states have internal predecessors, (58), 31 states have call successors, (41), 1 states have call predecessors, (41), 19 states have return successors, (41), 22 states have call predecessors, (41), 31 states have call successors, (41)
[2025-04-28 21:22:18,560 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:22:18,562 INFO  L93              Difference]: Finished difference Result 119 states and 222 transitions.
[2025-04-28 21:22:18,563 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. 
[2025-04-28 21:22:18,563 INFO  L79                 Accepts]: Start accepts. Automaton has  has 47 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 36 states have internal predecessors, (58), 31 states have call successors, (41), 1 states have call predecessors, (41), 19 states have return successors, (41), 22 states have call predecessors, (41), 31 states have call successors, (41) Word has length 76
[2025-04-28 21:22:18,564 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:22:18,566 INFO  L225             Difference]: With dead ends: 119
[2025-04-28 21:22:18,567 INFO  L226             Difference]: Without dead ends: 115
[2025-04-28 21:22:18,569 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 119 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=275, Invalid=4015, Unknown=0, NotChecked=0, Total=4290
[2025-04-28 21:22:18,570 INFO  L437           NwaCegarLoop]: 103 mSDtfsCounter, 38 mSDsluCounter, 2743 mSDsCounter, 0 mSdLazyCounter, 1305 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 2846 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 1305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time
[2025-04-28 21:22:18,572 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 2846 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 1305 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time]
[2025-04-28 21:22:18,573 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 115 states.
[2025-04-28 21:22:18,612 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 93.
[2025-04-28 21:22:18,616 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 93 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 44 states have internal predecessors, (50), 42 states have call successors, (42), 12 states have call predecessors, (42), 19 states have return successors, (74), 36 states have call predecessors, (74), 42 states have call successors, (74)
[2025-04-28 21:22:18,618 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 166 transitions.
[2025-04-28 21:22:18,618 INFO  L79                 Accepts]: Start accepts. Automaton has 93 states and 166 transitions. Word has length 76
[2025-04-28 21:22:18,620 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:22:18,620 INFO  L485      AbstractCegarLoop]: Abstraction has 93 states and 166 transitions.
[2025-04-28 21:22:18,620 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 47 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 36 states have internal predecessors, (58), 31 states have call successors, (41), 1 states have call predecessors, (41), 19 states have return successors, (41), 22 states have call predecessors, (41), 31 states have call successors, (41)
[2025-04-28 21:22:18,621 INFO  L278                IsEmpty]: Start isEmpty. Operand 93 states and 166 transitions.
[2025-04-28 21:22:18,624 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 77
[2025-04-28 21:22:18,624 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:22:18,624 INFO  L218           NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:22:18,633 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0
[2025-04-28 21:22:18,825 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:18,825 INFO  L403      AbstractCegarLoop]: === Iteration 5 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:22:18,826 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:22:18,826 INFO  L85        PathProgramCache]: Analyzing trace with hash 1365072121, now seen corresponding path program 2 times
[2025-04-28 21:22:18,826 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:22:18,826 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962940011]
[2025-04-28 21:22:18,826 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:22:18,826 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:22:18,860 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 76 statements into 2 equivalence classes.
[2025-04-28 21:22:18,897 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 76 of 76 statements.
[2025-04-28 21:22:18,897 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:22:18,897 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:20,365 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked.
[2025-04-28 21:22:20,365 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:22:20,366 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962940011]
[2025-04-28 21:22:20,366 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962940011] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:22:20,366 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271343244]
[2025-04-28 21:22:20,366 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:22:20,366 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:20,369 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:22:20,371 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:22:20,375 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2025-04-28 21:22:20,668 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 76 statements into 2 equivalence classes.
