bbbb bbox bboy bbyo bobb bobo bobu boby bonn bono bonu bony boob boon boox boun bouy boxy boyn boyo bubb bubo bubu bunb bunn buno bunu buon buoy buxy buyo buyu byno byob byon byun nbbo nboy nnnn nobo nobu non- nonn nono nonu nonx noo- noob noon nooo noun noyo nuby nunn nuno nuny nuon nyny nyon obbo obby obon obox oboy onby onno onon onoy onyx ooby oooo oun- ouu- oxo- oxon oxox oxxo oxy- oxyn oyon oyou oyun ubbo ubon ubyx unno unon unox uuno uuuu uuyn xbox xoxo xoyo xuxu xxxo xxxx xxxy ynon ynou yobo yono yoon youb youx yoyn yoyo yubu yunx yuny yuon yuxu yuyu yyyy