bbb bbf bbi bbo bbr bbs bbt bby bfb bff bfi bfo bfr bfs bft bfy bi- bib bif bii bio bir bis bit biy bob bof boi boo bor bos bot boy brb brf bri bro brr brs brt bry bsb bsf bsi bso bsr bss bst bsy btb btf bti bto btr bts btt bty by- byf byi byo byr bys byt fbb fbf fbi fbo fbr fbs fbt fff ffi ffo ffr ffs fft ffy fib fif fii fir fis fit fob fof foi foo for fos fot foy frb frf fri fro frr frs frt fry fsb fsf fsi fso fsr fss fst ftb ftf fti fto ftr fts ftt fty fy- fyb fyi fyo i-f ibb ibf ibi ibo ibr ibs ibt iby ifb iff ifi ifo ifr ifs ift ify iib iif iii iio iir iis iit io- iob iof ioi ioo ior ios iot ir- irb irf iri iro irr irs irt iry is- isb isf isi iso isr iss ist isy itb itf iti ito its itt ity iyo iyr iys iyt iyy o-i ob- obb obf obi obo obr obs obt oby of- ofb off ofi ofo ofr ofs oft oib oif oii oio oir ois oit oo- oob oof ooi ooo oor oos oot or- orb orf ori oro orr ors ort ory os- osb osf osi oso osr oss ost ot- otb otf oti oto otr ots ott oyi oyo oys rbb rbf rbi rbo rbr rbs rbt rfb rff rfi rfo rfr rfs rft rib rif rii rio rir ris rit riy rob rof roi roo ror ros rot roy rrb rrf rri rrr rrs rrt rsb rsf rsi rso rsr rss rst rtb rtf rti rto rtr rts rtt rty ry- ryf ryo ryr rys ryy sbb sbf sbi sbo sbr sbs sbt sby sfb sff sfi sfo sfr sfs sft sib sif sii sio sir sis sit sob sof soi soo sor sos sot soy sr- srb srf sri sro srr srs srt sry ss- ssb ssf ssi sso ssr sss sst stb stf sti sto str sts stt sty sy- syb syi syr sys syt tbb tbf tbi tbo tbr tbs tbt tfb tff tfi tfo tfr tfs tft tib tif tii tio tir tis tit tiy to- tob tof toi too tor tos tot toy trb trf tri tro trr trs trt try tsb tsf tsi tso tsr tss tst tsy ttb ttf tti tto ttr tts ttt tty tyf tyo tyr tys tyt ybf ybi ybr ybs yby yff yfr yfs yft yif yii yio yir yis yit yob yof yoi yoo yor yos yot yoy yrf yro yrs yrt ysb ysi yso ysr yss yst ysy ytf yto ytr yts ytt yyb yyf yys yyt yyy