java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/SifaC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem05_label42.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fab3c18 [2019-08-22 19:57:12,525 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-22 19:57:12,528 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-22 19:57:12,547 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-22 19:57:12,547 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-22 19:57:12,549 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-22 19:57:12,551 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-22 19:57:12,563 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-22 19:57:12,565 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-22 19:57:12,566 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-22 19:57:12,567 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-22 19:57:12,568 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-22 19:57:12,568 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-22 19:57:12,569 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-22 19:57:12,570 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-22 19:57:12,571 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-22 19:57:12,572 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-22 19:57:12,574 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-22 19:57:12,575 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-22 19:57:12,580 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-22 19:57:12,582 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-22 19:57:12,583 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-22 19:57:12,584 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-22 19:57:12,585 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-22 19:57:12,589 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-08-22 19:57:12,589 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-08-22 19:57:12,589 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-08-22 19:57:12,592 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-08-22 19:57:12,594 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-08-22 19:57:12,595 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-08-22 19:57:12,596 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-22 19:57:12,597 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-22 19:57:12,598 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-22 19:57:12,598 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-22 19:57:12,603 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-22 19:57:12,603 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-22 19:57:12,604 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-22 19:57:12,604 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-22 19:57:12,604 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-22 19:57:12,605 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-22 19:57:12,606 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-22 19:57:12,607 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-08-22 19:57:12,621 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-22 19:57:12,621 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-22 19:57:12,622 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-22 19:57:12,622 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-22 19:57:12,623 INFO L138 SettingsManager]: * Use SBE=true [2019-08-22 19:57:12,623 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-22 19:57:12,623 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-22 19:57:12,623 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-22 19:57:12,623 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-22 19:57:12,624 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-22 19:57:12,624 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-22 19:57:12,624 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-22 19:57:12,624 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-22 19:57:12,624 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-22 19:57:12,625 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-22 19:57:12,625 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-22 19:57:12,625 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-22 19:57:12,625 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-22 19:57:12,625 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-22 19:57:12,626 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-22 19:57:12,626 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-22 19:57:12,626 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-22 19:57:12,626 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-22 19:57:12,626 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-22 19:57:12,627 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-22 19:57:12,627 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-22 19:57:12,627 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-22 19:57:12,627 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-22 19:57:12,627 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-22 19:57:12,670 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-22 19:57:12,690 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-22 19:57:12,693 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-22 19:57:12,695 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-22 19:57:12,695 INFO L275 PluginConnector]: CDTParser initialized [2019-08-22 19:57:12,696 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem05_label42.c [2019-08-22 19:57:12,754 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cac4e6ec2/19c1a31d96d2439b9ff7d4827667c64b/FLAGa3a091c90 [2019-08-22 19:57:13,693 INFO L306 CDTParser]: Found 1 translation units. [2019-08-22 19:57:13,694 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem05_label42.c [2019-08-22 19:57:13,735 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cac4e6ec2/19c1a31d96d2439b9ff7d4827667c64b/FLAGa3a091c90 [2019-08-22 19:57:14,098 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cac4e6ec2/19c1a31d96d2439b9ff7d4827667c64b [2019-08-22 19:57:14,108 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-22 19:57:14,109 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-22 19:57:14,110 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-22 19:57:14,110 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-22 19:57:14,114 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-22 19:57:14,115 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:57:14" (1/1) ... [2019-08-22 19:57:14,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35c06ea7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:14, skipping insertion in model container [2019-08-22 19:57:14,118 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:57:14" (1/1) ... [2019-08-22 19:57:14,126 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-22 19:57:14,367 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-22 19:57:16,596 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-22 19:57:16,601 INFO L188 MainTranslator]: Completed pre-run [2019-08-22 19:57:17,753 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-22 19:57:17,827 INFO L192 MainTranslator]: Completed translation [2019-08-22 19:57:17,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17 WrapperNode [2019-08-22 19:57:17,828 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-22 19:57:17,829 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-22 19:57:17,829 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-22 19:57:17,829 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-22 19:57:17,842 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:17,843 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:17,930 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:17,931 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:18,096 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:18,145 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:18,197 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (1/1) ... [2019-08-22 19:57:18,266 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-22 19:57:18,267 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-22 19:57:18,267 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-22 19:57:18,267 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-22 19:57:18,269 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:57:17" (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 [2019-08-22 19:57:18,340 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-22 19:57:18,340 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-22 19:57:18,340 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-08-22 19:57:18,340 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-08-22 19:57:18,341 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-08-22 19:57:18,341 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2019-08-22 19:57:18,341 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2019-08-22 19:57:18,341 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2019-08-22 19:57:18,341 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output7 [2019-08-22 19:57:18,342 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output8 [2019-08-22 19:57:18,342 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-22 19:57:18,343 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-08-22 19:57:18,345 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-08-22 19:57:18,346 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-08-22 19:57:18,347 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2019-08-22 19:57:18,347 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2019-08-22 19:57:18,348 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2019-08-22 19:57:18,348 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output7 [2019-08-22 19:57:18,348 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output8 [2019-08-22 19:57:18,349 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-22 19:57:18,349 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-08-22 19:57:18,349 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-08-22 19:57:18,349 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-22 19:57:18,349 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-22 19:57:18,349 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-22 19:57:26,867 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-22 19:57:26,867 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-22 19:57:26,870 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:57:26 BoogieIcfgContainer [2019-08-22 19:57:26,870 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-22 19:57:26,871 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-22 19:57:26,871 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-22 19:57:26,871 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-22 19:57:26,872 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:57:26" (1/1) ... [2019-08-22 19:57:26,886 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-22 19:57:26,889 INFO L155 IcfgInterpreter]: Building call graph [2019-08-22 19:57:26,913 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-22 19:57:26,923 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-22 19:57:26,924 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-22 19:57:27,006 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 71 [2019-08-22 19:57:31,007 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:32,339 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:32,340 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:32,344 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:32,345 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:32,714 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 7 terms [2019-08-22 19:57:32,880 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-08-22 19:57:33,833 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-08-22 19:57:35,714 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-08-22 19:57:40,514 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-08-22 19:57:40,515 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 7 terms [2019-08-22 19:57:40,516 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 7 terms [2019-08-22 19:57:40,517 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 7 terms [2019-08-22 19:57:41,229 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-08-22 19:57:43,396 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 8 terms [2019-08-22 19:57:45,146 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 8 terms [2019-08-22 19:57:45,147 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:45,147 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:45,148 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:45,155 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:45,158 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:45,159 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:45,161 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:57:50,646 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 7 terms [2019-08-22 19:58:10,321 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-22 19:58:10,321 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 8 terms [2019-08-22 19:58:12,328 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 7 terms