bbb bbk bbo bbr bbs bbw bby bkb bkk bko bkr bks bkw bob bok boo bor bos bow boy boz brb brk bro brr brs brw bry brz bsb bsk bso bsr bss bsw bsy bwb bwk bwo bwr bws bwy by- byk byo byr bys byz bzo bzr bzs bzz k-z kbb kbk kbo kbr kbs kbw kbz kkb kkk kkr kks kky kob kok koo kor kos kow koy koz krk kro krr krs krw kry ksb ksk kso ksr kss ksw kw- kwk kwo kws kww kyo kyr kys kyw kyz kzo kzw kzy ob- obb obk obo obr obs obw oby okb okk oko okr oks okw oo- oob ook ooo oor oos oow or- orb ork oro orr ors ory orz os- osb osk oso osr oss osw owb owk owo ows oww oyo oys ozo ozs ozw ozz rbb rbk rbo rbr rbs rbw rkb rkk rko rks rky rkz rob rok roo ror ros row roy roz rrb rrk rrr rrs rsb rsk rso rsr rss rsw rwb rwr rws rwy ry- ryk ryo ryr rys ryy ryz rzb rzo rzy sbb sbk sbo sbr sbs sbw sby sk- skb skk sko skr sks skw sky sob sok soo sor sos sow soy soz sr- srb srk sro srr srs srw sry ss- ssb ssk sso ssr sss ssw ssz swb swk swo swr sws swy sy- syb syk syr sys szr wbb wbo wbr wbs wbw wbz wkb wko wkr wks wkw wky wob wok woo wor wos wow woy woz wr- wrk wro wrr wrs wrw wry wsb wsk wso wsr wss wsw wwo www wy- wyk wyo wyr wys ybr ybs yby ybz ykk yob yok yoo yor yos yow yoy yro yrs ysb ysk yso ysr yss ysy ysz yyb yys yyy yyz yzb yzr yzy zbb zbr zbs zbw zby zks zo- zob zok zoo zor zos zow zro zrs zsz zws zzr zzs zzy zzz