D/_incomplete////
D/equation////
D/group////
D/homomorphism////
D/homomorphism_homomorphism////
D/make////
D/map////
D/quadratic_equation////
D/set////
D/subgroup////
D/subgroup_homomorphism////
D/tuple////
D/word////
D/word_homomorphism////
D/word_subgroup////
D/word_word////
