b-u bbb bbk bbn bbo bbu bby bkb bkk bkn bko bnb bnk bnn bno bnu bob bok bon boo bou boy bub buk bun buo buu buy by- byk byn byo byu kbb kbk kbn kbo kbu kkb kkk kkn kku kky kn- knk knn kno knu kob kok kon koo kou koy kub kuk kun kuu kuy kyn kyo kyu nbb nbk nbn nbo nbu nkk nkn nko nku nky nnb nnk nnn nno nnu no- nob nok non noo nou noy nub nuk nun nuo nuu nuy nyk nyn nyo nyu nyy ob- obb obk obn obo obu oby okb okk oko oku on- onb onk onn ono onu ony oo- oob ook oon ooo ou- ouk oun ouo oyo ubb ubk ubn ubo ubu uby ukb ukk ukn uku un- unb unk unn uno unu uny uob uok uon uoo uun uuu uyo uyu yby ykk ykn ynk ynn ynu yny yob yok yon yoo you yoy yuk yun yuo yuu yuy yyb yyu yyy