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* src/tgbaalgos/closure.cc, src/tgbaalgos/closure.hh: Using vectors instead of sets and unordered maps, adding an overload to handle rvalue references. * src/tgbaalgos/stutterize.cc, src/tgbaalgos/stutterize.hh: Adding an overload to handle rvalue references. * bench/stutter/stutter_invariance_formulas.cc, bench/stutter/stutter_invariance_randomgraph.cc: Automata are modified in-place by is_stutter_invariant so they have to be copied before being processed. * src/tgbaalgos/stutter_invariance.cc, src/tgbaalgos/stutter_invariance.hh: Use the in-place version of closure and sl.
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