bbb bbi bbn bbr bbs bbt bby bi- bib bii bin bir bis bit biy bnb bni bnn bnr bns bnt brb bri brn brr brs brt bry bsb bsi bsn bsr bss bst bsy btb bti btn btr bts btt bty by- byi byn byr bys byt ibb ibi ibn ibr ibs ibt iby iib iii iin iir iis iit in- inb ini inn inr ins int iny ir- irb iri irn irr irs irt iry is- isb isi isn isr iss ist isy itb iti itn its itt ity iyr iys iyt iyy n-i nbb nbi nbn nbr nbs nbt nib nii nin nir nis nit nnb nni nnn nns nnt nrb nri nrn nrr nrs nrt nry nsb nsi nsn nsr nss nst nsy ntb nti ntn ntr nts ntt nyn nys nyt nyy rbb rbi rbn rbr rbs rbt rib rii rin rir ris rit riy rnb rni rnn rnr rns rnt rny rrb rri rrn rrr rrs rrt rsb rsi rsn rsr rss rst rtb rti rtn rtr rts rtt rty ry- ryn ryr rys ryy sbb sbi sbn sbr sbs sbt sby sib sii sin sir sis sit snb sni snn snr sns snt sny sr- srb sri srn srr srs srt sry ss- ssb ssi ssn ssr sss sst stb sti stn str sts stt sty sy- syb syi syn syr sys syt tbb tbi tbn tbr tbs tbt tib tii tin tir tis tit tiy tnb tni tnn tnr tns tnt trb tri trn trr trs trt try tsb tsi tsn tsr tss tst tsy ttb tti ttn ttr tts ttt tty tyn tyr tys tyt ybi ybr ybs yby yii yin yir yis yit ynn yns yny yrn yrs yrt ysb ysi ysr yss yst ysy ytn ytr yts ytt yyb yys yyt yyy