b-u bbb bbk bbm bbn bbo bbu bkb bkk bkm bkn bko bmb bmk bmm bmn bmo bmu bnb bnk bnn bno bnu bob bok bom bon boo bou bub buk bum bun buo buu kbb kbk kbm kbn kbo kbu kkb kkk kkm kkn kku kmb kmk kmm kmo kmu kn- knk knm knn kno knu kob kok kom kon koo kou kub kuk kum kun kuu m-o mbb mbk mbm mbo mbu mkb mkk mkm mkn mko mku mmb mmk mmm mmn mmo mmu mnb mnk mnm mnn mno mnu mob mok mom mon moo mou mub muk mum mun muu nbb nbk nbm nbn nbo nbu nkk nkm nkn nko nku nmb nmk nmm nmn nmo nmu nnb nnk nnm nnn nno nnu no- nob nok nom non noo nou nub nuk num nun nuo nuu ob- obb obk obm obn obo obu okb okk oko oku om- omb omm omn omo omu on- onb onk onn ono onu oo- oob ook oom oon ooo ou- ouk oum oun ouo ubb ubk ubn ubo ubu ukb ukk ukn uku um- umb umm umn umo umu un- unb unk unm unn uno unu uob uok uom uon uoo uum uun uuu