b-u bbb bbk bbm bbn bbu bkb bkk bkm bkn bmb bmk bmm bmn bmu bnb bnk bnn bnu bub buk bum bun buu kbb kbk kbm kbn kbu kkb kkk kkm kkn kku kmb kmk kmm kmu kn- knk knm knn knu kub kuk kum kun kuu mbb mbk mbm mbu mkb mkk mkm mkn mku mmb mmk mmm mmn mmu mnb mnk mnm mnn mnu mub muk mum mun muu nbb nbk nbm nbn nbu nkk nkm nkn nku nmb nmk nmm nmn nmu nnb nnk nnm nnn nnu nub nuk num nun nuu ubb ubk ubn ubu ukb ukk ukn uku um- umb umm umn umu un- unb unk unm unn unu uum uun uuu