proposition: Lemma randomSplit_codom : codom randomSplit <--> setT.
proof: Proof. by apply/subset_eqP; split=> // [[s1 s2]] _; apply: randomSplitAssumption. Qed.
imports: Coq(String List ZArith Lia) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool ssrnat eqtype seq) QuickChick(RandomQC RoseTrees Sets Tactics Producer)