bbb bbg bbi bbo bbr bbs bbt bgb bgg bgi bgo bgr bgs bgt bi- bib big bii bio bir bis bit bob bog boi boo bor bos bot brb brg bri bro brr brs brt bsb bsg bsi bso bsr bss bst btb btg bti bto btr bts btt gbg gbi gbo gbr gbs gbt ggb ggg ggi ggo ggr ggs ggt gib gig gii gio gir gis git gob gog goi goo gor gos got grb grg gri gro grr grs grt gsb gsg gsi gso gsr gss gst gtb gtg gti gto gtr gts gtt ibb ibg ibi ibo ibr ibs ibt igb igg igi igo igr igs igt iib iii iio iir iis iit io- iob iog ioi ioo ior ios iot ir- irb irg iri iro irr irs irt is- isb isg isi iso isr iss ist itb itg iti ito its itt o-i ob- obb obg obi obo obr obs obt ogg ogi ogo ogs ogt oib oii oio oir ois oit oo- oob oog ooi ooo oor oos oot or- orb org ori oro orr ors ort os- osb osg osi oso osr oss ost ot- otb otg oti oto otr ots ott rbb rbg rbi rbo rbr rbs rbt rgb rgg rgi rgo rgr rgs rgt rib rig rii rio rir ris rit rob rog roi roo ror ros rot rrb rrg rri rrr rrs rrt rsb rsg rsi rso rsr rss rst rtb rtg rti rto rtr rts rtt sbb sbg sbi sbo sbr sbs sbt sgb sgg sgi sgo sgr sgs sgt sib sig sii sio sir sis sit sob sog soi soo sor sos sot sr- srb srg sri sro srr srs srt ss- ssb ssg ssi sso ssr sss sst stb stg sti sto str sts stt tbb tbg tbi tbo tbr tbs tbt tgb tgg tgi tgo tgr tgs tgt tib tig tii tio tir tis tit to- tob tog toi too tor tos tot trb trg tri tro trr trs trt tsb tsg tsi tso tsr tss tst ttb ttg tti tto ttr tts ttt