b-u bbb bbg bbk bbm bbo bbu bgb bgg bgk bgm bgo bgu bkb bkg bkk bkm bko bmb bmg bmk bmm bmo bmu bob bog bok bom boo bou bub bug buk bum buo buu gbg gbk gbm gbo gbu ggb ggg ggm ggo ggu gkb gkm gko gmb gmg gmm gmo gob gog gok gom goo gou gu- gub gug guk gum guo guu kbb kbk kbm kbo kbu kgb kgm kgo kgu kkb kkk kkm kku kmb kmg kmk kmm kmo kmu kob kog kok kom koo kou kub kug kuk kum kuu m-o mbb mbg mbk mbm mbo mbu mgb mgk mgm mgo mgu mkb mkg mkk mkm mko mku mmb mmg mmk mmm mmo mmu mob mog mok mom moo mou mub mug muk mum muu ob- obb obg obk obm obo obu ogg ogo okb okg okk oko oku om- omb omg omm omo omu oo- oob oog ook oom ooo ou- ouk oum ouo ubb ubg ubk ubo ubu ugb ugg ugk ugm ugo ugu ukb ukk uku um- umb umg umm umo umu uob uog uok uom uoo uug uum uuu