/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/POPL2022/bluetooth10-incorrect.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d310483fe8b4879eee5de19363f50e4b839cc4ec-d310483 [2021-06-24 18:22:12,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-24 18:22:12,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-24 18:22:12,692 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-06-24 18:22:12,693 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-06-24 18:22:12,696 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-06-24 18:22:12,699 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-06-24 18:22:12,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-06-24 18:22:12,706 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-06-24 18:22:12,711 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-06-24 18:22:12,712 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-06-24 18:22:12,713 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-06-24 18:22:12,714 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-06-24 18:22:12,716 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-06-24 18:22:12,717 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-06-24 18:22:12,718 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-06-24 18:22:12,722 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-06-24 18:22:12,723 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-06-24 18:22:12,725 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-06-24 18:22:12,732 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-06-24 18:22:12,734 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-06-24 18:22:12,735 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-06-24 18:22:12,736 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-06-24 18:22:12,738 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-06-24 18:22:12,744 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-06-24 18:22:12,765 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-NoLbe.epf [2021-06-24 18:22:12,792 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-24 18:22:12,792 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-24 18:22:12,793 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-24 18:22:12,793 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-24 18:22:12,794 INFO L138 SettingsManager]: * Use SBE=true [2021-06-24 18:22:12,794 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-24 18:22:12,794 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-24 18:22:12,794 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-24 18:22:12,794 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-24 18:22:12,794 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-24 18:22:12,794 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-24 18:22:12,795 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-24 18:22:12,795 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-24 18:22:12,795 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-24 18:22:12,795 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-24 18:22:12,795 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-24 18:22:12,795 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-24 18:22:12,795 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-24 18:22:12,796 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-24 18:22:12,796 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-24 18:22:12,796 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-24 18:22:12,796 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-24 18:22:12,796 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-24 18:22:12,798 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-24 18:22:12,798 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-24 18:22:12,799 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-24 18:22:12,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-24 18:22:12,799 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-24 18:22:12,799 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-06-24 18:22:12,800 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-24 18:22:13,100 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-24 18:22:13,124 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-24 18:22:13,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-24 18:22:13,127 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-24 18:22:13,128 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-24 18:22:13,129 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/POPL2022/bluetooth10-incorrect.bpl [2021-06-24 18:22:13,130 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/POPL2022/bluetooth10-incorrect.bpl' [2021-06-24 18:22:13,153 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-24 18:22:13,155 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-24 18:22:13,156 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-24 18:22:13,156 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-24 18:22:13,156 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-24 18:22:13,166 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,172 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,184 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-24 18:22:13,186 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-24 18:22:13,186 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-24 18:22:13,186 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-24 18:22:13,193 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,194 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,194 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,195 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,198 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... [2021-06-24 18:22:13,199 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-24 18:22:13,200 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-24 18:22:13,200 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-24 18:22:13,200 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-24 18:22:13,201 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-24 18:22:13,286 INFO L124 BoogieDeclarations]: Specification and implementation of procedure DeviceThread given in one single declaration [2021-06-24 18:22:13,286 INFO L130 BoogieDeclarations]: Found specification of procedure DeviceThread [2021-06-24 18:22:13,286 INFO L138 BoogieDeclarations]: Found implementation of procedure DeviceThread [2021-06-24 18:22:13,286 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ServerThread given in one single declaration [2021-06-24 18:22:13,286 INFO L130 BoogieDeclarations]: Found specification of procedure ServerThread [2021-06-24 18:22:13,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ServerThread [2021-06-24 18:22:13,287 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-24 18:22:13,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-24 18:22:13,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-24 18:22:13,288 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-24 18:22:13,588 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-24 18:22:13,588 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-06-24 18:22:13,590 INFO L202 PluginConnector]: Adding new model bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.06 06:22:13 BoogieIcfgContainer [2021-06-24 18:22:13,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-24 18:22:13,592 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-24 18:22:13,592 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-24 18:22:13,594 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-24 18:22:13,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.06 06:22:13" (1/2) ... [2021-06-24 18:22:13,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53281dd7 and model type bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.06 06:22:13, skipping insertion in model container [2021-06-24 18:22:13,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "bluetooth10-incorrect.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.06 06:22:13" (2/2) ... [2021-06-24 18:22:13,597 INFO L111 eAbstractionObserver]: Analyzing ICFG bluetooth10-incorrect.bpl [2021-06-24 18:22:13,605 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-24 18:22:13,606 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-06-24 18:22:13,606 INFO L474 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-24 18:22:13,687 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-24 18:22:13,715 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-24 18:22:13,747 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-24 18:22:13,748 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-24 18:22:13,748 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-24 18:22:13,748 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-24 18:22:13,748 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-24 18:22:13,748 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-24 18:22:13,749 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-24 18:22:13,749 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == DeviceThreadThread1of1ForFork8======== [2021-06-24 18:22:13,775 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 116 places, 92 transitions, 239 flow [2021-06-24 18:22:13,839 INFO L129 PetriNetUnfolder]: 10/81 cut-off events. [2021-06-24 18:22:13,839 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-24 18:22:13,845 INFO L84 FinitePrefix]: Finished finitePrefix Result has 115 conditions, 81 events. 10/81 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 269 event pairs, 0 based on Foata normal form. 0/61 useless extension candidates. Maximal degree in co-relation 96. Up to 2 conditions per place. [2021-06-24 18:22:13,845 INFO L82 GeneralOperation]: Start removeDead. Operand has 116 places, 92 transitions, 239 flow [2021-06-24 18:22:13,851 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 105 places, 81 transitions, 195 flow [2021-06-24 18:22:13,879 INFO L129 PetriNetUnfolder]: 7/67 cut-off events. [2021-06-24 18:22:13,879 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-24 18:22:13,879 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-24 18:22:13,880 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-24 18:22:13,880 INFO L430 AbstractCegarLoop]: === Iteration 1 === [DeviceThreadErr0ASSERT_VIOLATIONASSERT]=== [2021-06-24 18:22:13,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-24 18:22:13,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1699369887, now seen corresponding path program 1 times [2021-06-24 18:22:13,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-24 18:22:13,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441515271] [2021-06-24 18:22:13,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-24 18:22:13,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-24 18:22:14,025 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-24 18:22:14,026 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-24 18:22:14,027 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-24 18:22:14,028 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 2 [2021-06-24 18:22:14,041 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-24 18:22:14,042 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-24 18:22:14,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441515271] [2021-06-24 18:22:14,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441515271] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-24 18:22:14,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-24 18:22:14,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-06-24 18:22:14,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993830929] [2021-06-24 18:22:14,053 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-24 18:22:14,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-24 18:22:14,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-24 18:22:14,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-24 18:22:14,070 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 70 out of 92 [2021-06-24 18:22:14,073 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 81 transitions, 195 flow. Second operand has 3 states, 3 states have (on average 70.66666666666667) internal successors, (212), 3 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-24 18:22:14,074 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-24 18:22:14,074 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 70 of 92 [2021-06-24 18:22:14,075 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand