bbb bbi bbl bbn bbr bbs bi- bib bii bil bin bir bis blb bli bll bln blr bls bnb bni bnl bnn bnr bns brb bri brl brn brr brs bsb bsi bsl bsn bsr bss ibb ibi ibl ibn ibr ibs iib iii iil iin iir iis il- ilb ili ill iln ilr ils in- inb ini inl inn inr ins ir- irb iri irl irn irr irs is- isb isi isl isn isr iss lbb lbi lbl lbr lbs lib lii lil lin lir lis llb lli lll lln llr lls lnb lni lnl lnn lnr lns lrb lri lrn lrr lrs lsb lsi lsl lsn lsr lss n-i nbb nbi nbl nbn nbr nbs nib nii nil nin nir nis nlb nli nll nln nlr nls nnb nni nnl nnn nns nrb nri nrl nrn nrr nrs nsb nsi nsl nsn nsr nss rbb rbi rbl rbn rbr rbs rib rii ril rin rir ris rli rll rln rlr rls rnb rni rnn rnr rns rrb rri rrl rrn rrr rrs rsb rsi rsl rsn rsr rss sbb sbi sbl sbn sbr sbs sib sii sil sin sir sis slb sli sll sln slr sls snb sni snl snn snr sns sr- srb sri srl srn srr srs ss- ssb ssi ssl ssn ssr sss