c-cor ccccc co-co cocc- cocco cocur cokk- coro- corvo couco couru crock croco crook crouk cruck cruor cucuk cukor cuoco curro ko-ko kocov kokko kokor kokou kokur kooru korck korku koror korro koruk kovor kovur krock kucuk kukko kukok kukur kurku kurov kuruc kuruk occur ockro okkur okoc okoro okuku okuru ooooo oovoo oroco oruku oruro ouoro r-co- ro-ro rocco rocko rocor rocou rocov rokkk rouko urour urucu uuork uuuuu uvrou vokov vooru vrock vucko