bbb bbk bbo bbr bbs bbw bkb bkk bko bkr bks bkw bob bok boo bor bos bow brb brk bro brr brs brw bsb bsk bso bsr bss bsw bwb bwk bwo bwr bws kbb kbk kbo kbr kbs kbw kkb kkk kkr kks kob kok koo kor kos kow krk kro krr krs krw ksb ksk kso ksr kss ksw kw- kwk kwo kws kww ob- obb obk obo obr obs obw okb okk oko okr oks okw oo- oob ook ooo oor oos oow or- orb ork oro orr ors os- osb osk oso osr oss osw owb owk owo ows oww rbb rbk rbo rbr rbs rbw rkb rkk rko rks rob rok roo ror ros row rrb rrk rrr rrs rsb rsk rso rsr rss rsw rwb rwr rws sbb sbk sbo sbr sbs sbw sk- skb skk sko skr sks skw sob sok soo sor sos sow sr- srb srk sro srr srs srw ss- ssb ssk sso ssr sss ssw swb swk swo swr sws wbb wbo wbr wbs wbw wkb wko wkr wks wkw wob wok woo wor wos wow wr- wrk wro wrr wrs wrw wsb wsk wso wsr wss wsw wwo www