fact: Definition ktc_step2c step (closure : ktc_fun) ctu ctr gtu := step (step (closure ctu ctr gtu)).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) fourcolor(hypermap geometry color chromogram coloring cfmap) fourcolor(cfcolor dyck ctree initctree gtree initgtree) fourcolor(gtreerestrict ctreerestrict)