b-u bbb bbi bbk bbl bbn bbu bi- bib bii bik bil bin biu bkb bkk bkl bkn blb bli blk bll bln blu bnb bni bnk bnl bnn bnu bub bui buk bul bun buu ibb ibi ibk ibl ibn ibu iib iii iil iin iiu ikb iki ikk ikl iku il- ilb ili ilk ill iln ilu in- inb ini ink inl inn inu iu- iub iui kbb kbi kbk kbl kbn kbu kib kii kik kil kin kiu kkb kki kkk kkl kkn kku kl- klb kli klu kn- kni knk knl knn knu kub kui kuk kul kun kuu lbb lbi lbk lbl lbu lib lii lik lil lin liu lkb lkl llb lli llk lll lln llu lnb lni lnk lnl lnn lnu lub lui luk lul lun luu n-i nbb nbi nbk nbl nbn nbu nib nii nik nil nin niu nki nkk nkn nku nlb nli nlk nll nln nlu nnb nni nnk nnl nnn nnu nub nui nuk nul nun nuu ubb ubi ubk ubl ubn ubu uib uii uil uin uiu ukb uki ukk ukl ukn uku ulb uli ulk ull uln ulu un- unb uni unk unl unn unu uun uuu