->associative_times in ⊢ (???(?(??%)?))
->commutative_times in ⊢ (???(?(??(??%))?))
-<associative_times in ⊢ (???(?(??%)?))
->(div_times_times ?? (n - k)) in ⊢ (???(??%))
+>associative_times in ⊢ (???(?(??%)?));
+>commutative_times in ⊢ (???(?(??(??%))?));
+<associative_times in ⊢ (???(?(??%)?));
+>(div_times_times ?? (n - k)) in ⊢ (???(??%)) ;