fact: Definition check_dbound1 p ns := let: DruleFork rs _ _ := rf in check_dbound1_rec p rs ns (size rs + 1).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) mathcomp(bigop order ssralg ssrnum ssrint) fourcolor(hypermap geometry quiztree part discharge)