proposition: Lemma planar_snipd : planar snip_disk.
proof: Proof. by move: planarG; rewrite (planar_patch snip_patch); case/andP. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) fourcolor(hypermap jordan color geometry patch)