bbb bbg bbi bbk bbo bbr bbs bgb bgg bgi bgk bgo bgr bgs bi- bib big bii bik bio bir bis bkb bkg bkk bko bkr bks bob bog boi bok boo bor bos brb brg bri brk bro brr brs bsb bsg bsi bsk bso bsr bss gbg gbi gbk gbo gbr gbs ggb ggg ggi ggo ggr ggs gib gig gii gik gio gir gis gkb gko gks gob gog goi gok goo gor gos grb grg gri grk gro grr grs gsb gsg gsi gsk gso gsr gss ibb ibg ibi ibk ibo ibr ibs igb igg igi igk igo igr igs iib iii iio iir iis ikb iki ikk iko ikr iks io- iob iog ioi ioo ior ios ir- irb irg iri irk iro irr irs is- isb isg isi isk iso isr iss kbb kbi kbk kbo kbr kbs kgb kgi kgo kgs kib kig kii kik kio kir kis kkb kki kkk kkr kks kob kog koi kok koo kor kos krg kri krk kro krr krs ksb ksg ksi ksk kso ksr kss o-i ob- obb obg obi obk obo obr obs ogg ogi ogo ogs oib oii oik oio oir ois okb okg oki okk oko okr oks oo- oob oog ooi ook ooo oor oos or- orb org ori ork oro orr ors os- osb osg osi osk oso osr oss rbb rbg rbi rbk rbo rbr rbs rgb rgg rgi rgk rgo rgr rgs rib rig rii rik rio rir ris rkb rkg rkk rko rks rob rog roi rok roo ror ros rrb rrg rri rrk rrr rrs rsb rsg rsi rsk rso rsr rss sbb sbg sbi sbk sbo sbr sbs sgb sgg sgi sgk sgo sgr sgs sib sig sii sik sio sir sis sk- skb skg ski skk sko skr sks sob sog soi sok soo sor sos sr- srb srg sri srk sro srr srs ss- ssb ssg ssi ssk sso ssr sss