c-cor ccccc cnnnn co-co cocc- cocco cocon cocur codco codo codon codru conco concr condo condr connu cono- conon conor coord corno cornu coro- corod coron corun couco cound courd couru croco crodo crood croon croud croun crudo cruor cunco cuoco curno curro d-con d-cru d-rod dconn ddddd do-do dodon dodoo dodro dondo donon donor doodo doorn dorno doron dorud douro drood droon droun ducor ducun duddo dudon dudou duduc dundo dunno dunod dunun durno duroc duron ndour nduru nnooo no-do no-no non-u nondo nonno noonu noord norcd norco nordo noroc noron norro norun nu-nu nucor nudur nunon nunun nuoro nurun occur ocorn oddur odour odudu oduro oncdr onco- onond onoon onorn onour ooooo orcon ordoc ordon ordro orduc ornon oroco orodo orono oruro oudon ouoro ourno r-co- ro-ro rocco rocor rocou rodoc rodon rodor ronco rondo ronno roodu roond round rudno runcu rundu runo- runon u-con uconn unccd uncod uncon uncor undun undur unnun unnur unodc unoor unorn unrun unurn urour urucu uuuuu