b-u bbb bbi bbl bbn bbr bbs bbu bi- bib bii bil bin bir bis biu blb bli bll bln blr bls blu bnb bni bnl bnn bnr bns bnu brb bri brl brn brr brs bru bsb bsi bsl bsn bsr bss bsu bub bui bul bun bur bus buu ibb ibi ibl ibn ibr ibs ibu iib iii iil iin iir iis iiu il- ilb ili ill iln ilr ils ilu in- inb ini inl inn inr ins inu ir- irb iri irl irn irr irs iru is- isb isi isl isn isr iss isu iu- iub iui iur ius lbb lbi lbl lbr lbs lbu lib lii lil lin lir lis liu llb lli lll lln llr lls llu lnb lni lnl lnn lnr lns lnu lrb lri lrn lrr lrs lru lsb lsi lsl lsn lsr lss lsu lub lui lul lun lur lus luu n-i nbb nbi nbl nbn nbr nbs nbu nib nii nil nin nir nis niu nlb nli nll nln nlr nls nlu nnb nni nnl nnn nns nnu nrb nri nrl nrn nrr nrs nru nsb nsi nsl nsn nsr nss nsu nub nui nul nun nur nus nuu rbb rbi rbl rbn rbr rbs rbu rib rii ril rin rir ris rli rll rln rlr rls rlu rnb rni rnn rnr rns rnu rrb rri rrl rrn rrr rrs rru rsb rsi rsl rsn rsr rss rsu rub rui run rur rus ruu sbb sbi sbl sbn sbr sbs sbu sib sii sil sin sir sis siu slb sli sll sln slr sls slu snb sni snl snn snr sns snu sr- srb sri srl srn srr srs ss- ssb ssi ssl ssn ssr sss ssu sub sui sul sun sur sus suu ubb ubi ubl ubn ubr ubs ubu uib uii uil uin uir uis uiu ulb uli ull uln ulr uls ulu un- unb uni unl unn unr uns unu ur- urb uri url urn urr urs uru usb usi usl usn usr uss usu uun uur uus uuu