fact: Definition reducible_in_range j1 j2 (cfs : seq config) := forall i, j1 <= i -> i < j2 -> cfreducible (nth cf000 cfs i).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) fourcolor(hypermap geometry color chromogram coloring kempe) fourcolor(cfmap cfcolor cfcontract ctree kempetree)