bbb bbf bbg bbi bbo bbr bbs bbt bfb bff bfg bfi bfo bfr bfs bft bgb bgf bgg bgi bgo bgr bgs bgt bi- bib bif big bii bio bir bis bit bob bof bog boi boo bor bos bot brb brf brg bri bro brr brs brt bsb bsf bsg bsi bso bsr bss bst btb btf btg bti bto btr bts btt fbb fbf fbg fbi fbo fbr fbs fbt fff ffg ffi ffo ffr ffs fft fgb fgf fgg fgi fgr fgs fgt fib fif fig fii fir fis fit fob fof fog foi foo for fos fot frb frf frg fri fro frr frs frt fsb fsf fsg fsi fso fsr fss fst ftb ftf ftg fti fto ftr fts ftt gbf gbg gbi gbo gbr gbs gbt gfb gff gfi gfo gfr gfs gft ggb ggg ggi ggo ggr ggs ggt gib gif gig gii gio gir gis git gob gof gog goi goo gor gos got grb grf grg gri gro grr grs grt gsb gsf gsg gsi gso gsr gss gst gtb gtf gtg gti gto gtr gts gtt i-f ibb ibf ibg ibi ibo ibr ibs ibt ifb iff ifg ifi ifo ifr ifs ift igb igf igg igi igo igr igs igt iib iif iii iio iir iis iit io- iob iof iog ioi ioo ior ios iot ir- irb irf irg iri iro irr irs irt is- isb isf isg isi iso isr iss ist itb itf itg iti ito its itt o-i ob- obb obf obg obi obo obr obs obt of- ofb off ofg ofi ofo ofr ofs oft ogf ogg ogi ogo ogs ogt oib oif oii oio oir ois oit oo- oob oof oog ooi ooo oor oos oot or- orb orf org ori oro orr ors ort os- osb osf osg osi oso osr oss ost ot- otb otf otg oti oto otr ots ott rbb rbf rbg rbi rbo rbr rbs rbt rfb rff rfg rfi rfo rfr rfs rft rgb rgf rgg rgi rgo rgr rgs rgt rib rif rig rii rio rir ris rit rob rof rog roi roo ror ros rot rrb rrf rrg rri rrr rrs rrt rsb rsf rsg rsi rso rsr rss rst rtb rtf rtg rti rto rtr rts rtt sbb sbf sbg sbi sbo sbr sbs sbt sfb sff sfg sfi sfo sfr sfs sft sgb sgf sgg sgi sgo sgr sgs sgt sib sif sig sii sio sir sis sit sob sof sog soi soo sor sos sot sr- srb srf srg sri sro srr srs srt ss- ssb ssf ssg ssi sso ssr sss sst stb stf stg sti sto str sts stt tbb tbf tbg tbi tbo tbr tbs tbt tfb tff tfg tfi tfo tfr tfs tft tgb tgf tgg tgi tgo tgr tgs tgt tib tif tig tii tio tir tis tit to- tob tof tog toi too tor tos tot trb trf trg tri tro trr trs trt tsb tsf tsg tsi tso tsr tss tst ttb ttf ttg tti tto ttr tts ttt