proposition: Lemma fitqzp_proper zp q : fitqzp zp q -> Qask0 = q \/ zproper zp.
proof: Proof. by case: q; first by [left]; case: zp => -[]; right. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) fourcolor(hypermap geometry part quiz quiztree)