fact: Parameter well_formed_cf_build_inside : forall f t l1 l2, arity f = AC -> well_formed_cf (Term f (l1 ++ t :: l2)) -> well_formed_cf (build f (l1 ++ l2)).
imports: Coq(Relations List Arith Morphisms) CoLoR(more_list list_permut list_sort term_spec term_o equational_theory_spec equational_theory)