c-cor ccccc ceco- ceere ceoce ceoor cerc- cerce cerco cerec cerer cerke cero- ceroc cerre cerro co-co cocc- cocce cocco coceo cocke coker cokk- cooee cooer cooke coore corce core- coree corer corke coro- corre crece creek creer creke creo- croce crock croco croke crooe crook crore ecker eecke eeeee ekeko ekker eorre erere erkec erkko erkoc eroor erore error kecer keere kekec kerek kerre ko-ko kocek kocer kocke koker kokko kokor kokre korck korec korek korke koror korro kre-o kreek kreke kreo- krock kroke ocker ockro ocoee ocree oeco- okeke okere okker okoc okoro oo-er oocre ooooo oreck oreco oreo- orere orero oroco oroer oroke r-co- recce recco recke reece reere rekke rere- reree ro-ro rocco rocke rocko rocor roero rokee roker rokke rokkk rooer rooke roore rorer rorke