bbb bbi bbk bbo bbr bbs bby bi- bib bii bik bio bir bis biy bkb bkk bko bkr bks bob boi bok boo bor bos boy brb bri brk bro brr brs bry bsb bsi bsk bso bsr bss bsy by- byi byk byo byr bys ibb ibi ibk ibo ibr ibs iby iib iii iio iir iis ikb iki ikk iko ikr iks io- iob ioi ioo ior ios ir- irb iri irk iro irr irs iry is- isb isi isk iso isr iss isy iyo iyr iys iyy kbb kbi kbk kbo kbr kbs kib kii kik kio kir kis kkb kki kkk kkr kks kky kob koi kok koo kor kos koy kri krk kro krr krs kry ksb ksi ksk kso ksr kss kyo kyr kys o-i ob- obb obi obk obo obr obs oby oib oii oik oio oir ois okb oki okk oko okr oks oo- oob ooi ook ooo oor oos or- orb ori ork oro orr ors ory os- osb osi osk oso osr oss oyi oyo oys rbb rbi rbk rbo rbr rbs rib rii rik rio rir ris riy rkb rkk rko rks rky rob roi rok roo ror ros roy rrb rri rrk rrr rrs rsb rsi rsk rso rsr rss ry- ryk ryo ryr rys ryy sbb sbi sbk sbo sbr sbs sby sib sii sik sio sir sis sk- skb ski skk sko skr sks sky sob soi sok soo sor sos soy sr- srb sri srk sro srr srs sry ss- ssb ssi ssk sso ssr sss sy- syb syi syk syr sys ybi ybr ybs yby yii yio yir yis yki ykk yob yoi yok yoo yor yos yoy yro yrs ysb ysi ysk yso ysr yss ysy yyb yys yyy