b-u bbb bbh bbk bbn bbo bbu bhb bhh bhk bho bhu bkb bkk bkn bko bnb bnk bnn bno bnu bob boh bok bon boo bou bub buh buk bun buo buu hbb hbh hbk hbn hbo hbu hhb hhh hhk hhn hho hhu hkb hkh hkk hkn hko hku hnb hnh hnk hnn hno hnu hob hoh hok hon hoo hou hub huh huk hun huo huu kbb kbh kbk kbn kbo kbu khh khk khn kho khu kkb kkh kkk kkn kku kn- knk knn kno knu kob koh kok kon koo kou kub kuh kuk kun kuu nbb nbk nbn nbo nbu nhb nhh nhk nhn nhu nkk nkn nko nku nnb nnh nnk nnn nno nnu no- nob noh nok non noo nou nub nuh nuk nun nuo nuu ob- obb obh obk obn obo obu ohh ohn oho ohu okb okk oko oku on- onb onh onk onn ono onu oo- oob ooh ook oon ooo ou- ouh ouk oun ouo ubb ubh ubk ubn ubo ubu uhb uhh uho uhu ukb ukk ukn uku un- unb unh unk unn uno unu uob uok uon uoo uun uuu