bo-bo boboc bobr bocon bocor bonon bonou booco boorn booru borbo born- borno bornu boro- boron boroo borou borro borun bourn brobo bronc bronn broon broun brrrr brunn bruno bruun bubon bucco bucur bunco bunun buono burcu burn- buron buroo burro burru buruc burun c-cor ccccc cnnnn co-bo co-co cocc- cocco cocon cocur conco concr connu cono- conob conon conor corbo corbu corno cornu coro- coron corun couco courb couru croco croon croun cruor cubo- cubub cunco cuoco curno curro nnooo no-no nobob nobuo non-u nonno noonu norbu norco noroc noron norro norun nu-nu nucor nunon nunun nuoro nurun o-bon o-r-b oboro occur ocorn ocr-b onco- onnbc onoon onorn onour ooooo orcon ornon orobo oroco orono oruro ouoro ourno r-co- ro-ro robbo robo- robon robor robun robur rocco rocor rocou ronco ronno rorbu rubon rubor runcu runo- runon u-con ubobo uconn uncon uncor unnun unnur unoor unorn unrun unurn uroob urour urubu urucu uuuuu