c-cor c-p-c c-pop ccccc ceco- ceere cefor ceoce ceoor ceppo cerc- cerce cerco cerec cerer cero- ceroc cerre cerro co-co co-op cocc- cocce cocco coceo coepe cofer coffe cofre cooee cooer coope coore copce copec coper coppe coppo copr- copre copro corce core- coree corer corfe corfo coro- corop corpe corre cpcfc crece creep creer creo- creop crepe croce croco crooe croop cropc crope cropo crore e-pro ecoff ecorp eeeee eepee efere effer efore eofor eorre eperc erere eroor erore error feeor feere fefor feoff ferce ferr- ferre ferro focer foore force fore- foreo forro frcpc freep freer frere froop frore o-fer ocoee ocree oeco- oeppo offer offof offre ofpop oo-er oocre ooooo opepe opere opper orcop oreco oreo- orere orero orfeo orfoe orfor oroco oroer p-rep pecco peece peere pepco pepee peppe perce perec perer perre perro pforp po-po pocop pooer poope poopo poore popco poper popop poppe poppo porco porec porer poro- porro prece preco preef preff preop proer profe proff proof proor prop- prope propp propr prore r-co- recce recco recep reece reefe reepe reere refco refer reffe reffo repco repec repop repor reppe repro rere- reree ro-ro rocco rocor roero roffe rofor rooer roofe roope roore roper roppe rorer rperf rprop