b-u bbb bbg bbk bbn bbo bbu bgb bgg bgk bgn bgo bgu bkb bkg bkk bkn bko bnb bng bnk bnn bno bnu bob bog bok bon boo bou bub bug buk bun buo buu gbg gbk gbn gbo gbu ggb ggg ggn ggo ggu gkb gkn gko gnb gnn gno gnu gob gog gok gon goo gou gu- gub gug guk gun guo guu kbb kbk kbn kbo kbu kgb kgo kgu kkb kkk kkn kku kn- kng knk knn kno knu kob kog kok kon koo kou kub kug kuk kun kuu nbb nbg nbk nbn nbo nbu ngb ngg ngk ngn ngo ngu nkk nkn nko nku nnb nng nnk nnn nno nnu no- nob nog nok non noo nou nub nug nuk nun nuo nuu ob- obb obg obk obn obo obu ogg ogn ogo okb okg okk oko oku on- onb ong onk onn ono onu oo- oob oog ook oon ooo ou- ouk oun ouo ubb ubg ubk ubn ubo ubu ugb ugg ugk ugn ugo ugu ukb ukk ukn uku un- unb ung unk unn uno unu uob uog uok uon uoo uug uun uuu