bbbb bcbc bccc bcnu bcuc bnoc bobb bobo bobu boco bocu bonc bonn bono bonu boob booc boon boun bubb bubo bubu bucc buco bucu bunb bunn buno bunu buon c-bo cbbc cbcc cbcn cbcu ccbc ccbn cccb cccc cccu ccnb ccnc ccnu ccob ccoc ccuc cnbc cnco cobb cobo cobu coco cocu con- conc conn cono coob coon coub coun cub- cubb cucc cucn cuno cuon nbbc nbbo nbcc nbco ncbc nccc nccn nccu ncnc ncoc nnnn nobc nobo nobu noco non- nonn nono nonu noo- noob noon nooo noun nubc nucu nunc nunn nuno nuoc nuon obbo obon ocbc occc occn ocon onc- onco onno onon oooo oucc oun- ouu- ubbo uboc ubon ucbc ucon uncc unco unno unon uocc uuno uuoc uuuu