c-cor c-p-c c-pop ccccc ceco- ceere ceoce ceoor ceppo cerc- cerce cerco cerec cerer cero- ceroc cerre cerro co-co co-op cocc- cocce cocco coceo coepe cooee cooer coope coore copce copec coper coppe coppo copr- copre copro corce core- coree corer coro- corop corpe corre crece creep creer creo- creop crepe croce croco crooe croop cropc crope cropo crore e-pro ecorp eeeee eepee eorre eperc erere eroor erore error ocoee ocree oeco- oeppo oo-er oocre ooooo opepe opere opper orcop oreco oreo- orere orero oroco oroer p-rep pecco peece peere pepco pepee peppe perce perec perer perre perro po-po pocop pooer poope poopo poore popco poper popop poppe poppo porco porec porer poro- porro prece preco preop proer proor prop- prope propp propr prore r-co- recce recco recep reece reepe reere repco repec repop repor reppe repro rere- reree ro-ro rocco rocor roero rooer roope roore roper roppe rorer rprop