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* src/tgbaalgos/closure.cc, src/tgbaalgos/closure.hh: Add closure function. * src/tgbaalgos/stutterize.cc, src/tgbaalgos/stutterize.hh: Add two implementations of "self-loopize" function. * src/tgbaalgos/Makefile.am: Add them. * src/tgba/tgbasl.cc, src/tgba/tgbasl.hh: On-the-fly implementation of self-loopize. * src/tgba/Makefile.am: Add it. * src/tgbatest/ltl2tgba.cc, src/tgbatest/stutter_invariant.test: Test closure and sl. * src/tgbatest/Makefile.am: Adjust. * src/bin/ltlfilt.cc: Modify stutter-invariant option to use automaton-based checking rather than syntactic-based checking. * src/ltlvisit/remove_x.cc, src/ltlvisit/remove_x.hh: Remove is_stutter_insensitive function. * src/tgbaalgos/stutter_invariance.cc, src/tgbaalgos/stutter_invariance.hh: Check if a formula is stutter-invariant using closure and sl. * wrap/python/spot.i: Add closure and sl bindings. * bench/stutter/stutter_invariance_formulas.cc: Generate benchmarks from given formulas. * bench/stut...
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