proposition: Lemma inl_sub_fam_im4: injection_prop inl_p7c2_ip (inductive_limit inl_p7c2_S'') (inductive_limit S).
proof: Proof. by move: (inl_subfam_prop4 (inl_sub_fam_im3)). Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat)