c-cor ccccc ceco- ceere cefor ceoce ceoor cerc- cerce cerco cerec cerer cero- ceroc cerre cerro co-co cocc- cocce cocco coceo cofer coffe cofre cooee cooer coore corce core- coree corer corfe corfo coro- corre crece creer creo- croce croco crooe crore ecoff eeeee efere effer efore eofor eorre erere eroor erore error feeor feere fefor feoff ferce ferr- ferre ferro focer foore force fore- foreo forro freer frere frore o-fer ocoee ocree oeco- offer offof offre oo-er oocre ooooo oreco oreo- orere orero orfeo orfoe orfor oroco oroer r-co- recce recco reece reefe reere refco refer reffe reffo rere- reree ro-ro rocco rocor roero roffe rofor rooer roofe roore rorer