b-u bbb bbi bbk bbn bbu bi- bib bii bik bin biu bkb bkk bkn bnb bni bnk bnn bnu bub bui buk bun buu ibb ibi ibk ibn ibu iib iii iin iiu ikb iki ikk iku in- inb ini ink inn inu iu- iub iui kbb kbi kbk kbn kbu kib kii kik kin kiu kkb kki kkk kkn kku kn- kni knk knn knu kub kui kuk kun kuu n-i nbb nbi nbk nbn nbu nib nii nik nin niu nki nkk nkn nku nnb nni nnk nnn nnu nub nui nuk nun nuu ubb ubi ubk ubn ubu uib uii uin uiu ukb uki ukk ukn uku un- unb uni unk unn unu uun uuu