fact: Definition scycle_planar_bridgeless_plain_quasicubic_connected_pbpc_base : scycle_planar_bridgeless_plain_quasicubic_connected -> planar_bridgeless_plain_connected.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) fourcolor(hypermap jordan)