bbb bbi bbk bbo bbr bbs bby bi- bib bii bik bio bir bis biy biz bkb bkk bko bkr bks bob boi bok boo bor bos boy boz brb bri brk bro brr brs bry brz bsb bsi bsk bso bsr bss bsy by- byi byk byo byr bys byz bzo bzr bzs bzz ibb ibi ibk ibo ibr ibs iby ibz 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 izi izo izy izz k-z kbb kbi kbk kbo kbr kbs kbz kib kii kik kio kir kis kiz kkb kki kkk kkr kks kky kob koi kok koo kor kos koy koz kri krk kro krr krs kry ksb ksi ksk kso ksr kss kyo kyr kys kyz kzo kzy o-i ob- obb obi obk obo obr obs oby oib oii oik oio oir ois oiz okb oki okk oko okr oks oo- oob ooi ook ooo oor oos or- orb ori ork oro orr ors ory orz os- osb osi osk oso osr oss oyi oyo oys ozo ozs ozz rbb rbi rbk rbo rbr rbs rib rii rik rio rir ris riy riz rkb rkk rko rks rky rkz rob roi rok roo ror ros roy roz rrb rri rrk rrr rrs rsb rsi rsk rso rsr rss ry- ryk ryo ryr rys ryy ryz rzb rzo rzy 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 soz sr- srb sri srk sro srr srs sry ss- ssb ssi ssk sso ssr sss ssz sy- syb syi syk syr sys szi szr ybi ybr ybs yby ybz yii yio yir yis yiz yki ykk yob yoi yok yoo yor yos yoy yro yrs ysb ysi ysk yso ysr yss ysy ysz yyb yys yyy yyz yzb yzr yzy zbb zbr zbs zby zib zik zio zir zis ziz zks zo- zob zoi zok zoo zor zos zro zrs zsi zsz zzr zzs zzy zzz