->commutative_times >(div_mod n p) in ⊢ (??%?)
->(div_mod m p) in ⊢ (??%?) <(commutative_plus (m \mod p))
-<congnm <(minus_minus ? (n \mod p)) <minus_plus_m_m //
+>commutative_times >(div_mod n p) in ⊢ (??%?);
+>(div_mod m p) in ⊢ (??%?); <(commutative_plus (m \mod p))
+<congnm <(minus_plus ? (n \mod p)) <minus_plus_m_m //