b-u bbb bbn bbo bbu bby bnb bnn bno bnu bob bon boo bou boy bub bun buo buu buy by- byn byo byu nbb nbn nbo nbu nnb nnn nno nnu no- nob non noo nou noy nub nun nuo nuu nuy nyn nyo nyu nyy ob- obb obn obo obu oby on- onb onn ono onu ony oo- oob oon ooo ou- oun ouo oyo ubb ubn ubo ubu uby un- unb unn uno unu uny uob uon uoo uun uuu uyo uyu yby ynn ynu yny yob yon yoo you yoy yun yuo yuu yuy yyb yyu yyy