bbbb bbdd bbdo bblb blno blob blod blon bloo blou blub blud bobb bobo bobu bodb bodo bodu bold boll boln bolo bolu bond bonn bono bonu boob bood bool boon boud boul boun bubb bubo bubu budb budd budl budo budu bulb buld bull bulu bunb bund bunn buno bunu buol buon d-bo dbnl dddd ddub dlbd dobb dobl dobu dod- dodd dodo dold doll dolo dolu dond donn dono doob dood dool doon doub doud doul doun dub- dubb dubu dudd dudo dudu dull dulo dulu dunn duno duo- duon duul lldb llll llod lloo llud lndn lob- lobb lobo lold loll lolo lond lono loob lood lool loon loud loul loun louu ludd ludo lull lulu lund lunn luno nbbo nddb nddo nndb nnnn nobo nobu nodo nodu nold noll nolo non- nonn nono nonu noo- noob nool noon nooo noul noun nubl nudd nudo null nunn nuno nuon obbo oblu obol obon odbo oddd odnb odon odoo odou olbo oldb oldn ollo olon ondo onno onod onon oold oolo oooo ould oulu oun- ound ouu- ubbo ublo ubod ubon ubud udon udoo udun ullo ulno ulo- ulul unbd undo unno unon uulu uuno uuuu