minimize_wdba() failed to fully minimize some automata.
* src/tgbaalgos/minimize.cc (minimize_wdba): Fix the Löding algorithm to use colors. The previous implementation was an incorrect approximation. * src/tgbatest/wdba2.test: New file showing two equivalent formulas that were minimized in automata with different sizes. * src/tgbatest/Makefile.am: Add it.
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