b-u bbb bbi bbl bbn bbr bbu bi- bib bii bil bin bir biu blb bli bll bln blr blu bnb bni bnl bnn bnr bnu brb bri brl brn brr bru bub bui bul bun bur buu ibb ibi ibl ibn ibr ibu iib iii iil iin iir iiu il- ilb ili ill iln ilr ilu in- inb ini inl inn inr inu ir- irb iri irl irn irr iru iu- iub iui iur lbb lbi lbl lbr lbu lib lii lil lin lir liu llb lli lll lln llr llu lnb lni lnl lnn lnr lnu lrb lri lrn lrr lru lub lui lul lun lur luu n-i nbb nbi nbl nbn nbr nbu nib nii nil nin nir niu nlb nli nll nln nlr nlu nnb nni nnl nnn nnu nrb nri nrl nrn nrr nru nub nui nul nun nur nuu rbb rbi rbl rbn rbr rbu rib rii ril rin rir rli rll rln rlr rlu rnb rni rnn rnr rnu rrb rri rrl rrn rrr rru rub rui run rur ruu ubb ubi ubl ubn ubr ubu uib uii uil uin uir uiu ulb uli ull uln ulr ulu un- unb uni unl unn unr unu ur- urb uri url urn urr uru uun uur uuu