-*.cmi
-*.cmo
-*.cma
-*.cmx
-*.o
-*.a
-*.opt
-ring_tutor.ml
-fourier_tutor.ml
-reflexivity_tutor.ml
-symmetry_tutor.ml
-assumption_tutor.ml
-contradiction_tutor.ml
-exists_tutor.ml
-split_tutor.ml
-left_tutor.ml
-right_tutor.ml
-ring_tutor
-fourier_tutor
-reflexivity_tutor
-symmetry_tutor
-assumption_tutor
-contradiction_tutor
-exists_tutor
-split_tutor
-left_tutor
-right_tutor
-search_pattern_apply_tutor