b-u bbb bbi bbk bbn bbr bbu bi- bib bii bik bin bir biu bkb bkk bkn bkr bnb bni bnk bnn bnr bnu brb bri brk brn brr bru bub bui buk bun bur buu ibb ibi ibk ibn ibr ibu iib iii iin iir iiu ikb iki ikk ikr iku in- inb ini ink inn inr inu ir- irb iri irk irn irr iru iu- iub iui iur kbb kbi kbk kbn kbr kbu kib kii kik kin kir kiu kkb kki kkk kkn kkr kku kn- kni knk knn knr knu kri krk krn krr kru kub kui kuk kun kur kuu n-i nbb nbi nbk nbn nbr nbu nib nii nik nin nir niu nki nkk nkn nkr nku nnb nni nnk nnn nnu nrb nri nrk nrn nrr nru nub nui nuk nun nur nuu rbb rbi rbk rbn rbr rbu rib rii rik rin rir rkb rkk rku rnb rni rnn rnr rnu rrb rri rrk rrn rrr rru rub rui ruk run rur ruu ubb ubi ubk ubn ubr ubu uib uii uin uir uiu ukb uki ukk ukn ukr uku un- unb uni unk unn unr unu ur- urb uri urk urn urr uru uun uur uuu