b-u bbb bbk bbl bbn bbu bkb bkk bkl bkn blb blk bll bln blu bnb bnk bnl bnn bnu bub buk bul bun buu kbb kbk kbl kbn kbu kkb kkk kkl kkn kku kl- klb klu kn- knk knl knn knu kub kuk kul kun kuu lbb lbk lbl lbu lkb lkl llb llk lll lln llu lnb lnk lnl lnn lnu lub luk lul lun luu nbb nbk nbl nbn nbu nkk nkn nku nlb nlk nll nln nlu nnb nnk nnl nnn nnu nub nuk nul nun nuu ubb ubk ubl ubn ubu ukb ukk ukl ukn uku ulb ulk ull uln ulu un- unb unk unl unn unu uun uuu