b-u bbb bbk bbo bbr bbs bbu bbw bby bkb bkk bko bkr bks bkw bob bok boo bor bos bou bow boy brb brk bro brr brs bru brw bry bsb bsk bso bsr bss bsu bsw bsy bub buk buo bur bus buu buw buy bwb bwk bwo bwr bws bwu bwy by- byk byo byr bys byu kbb kbk kbo kbr kbs kbu kbw kkb kkk kkr kks kku kky kob kok koo kor kos kou kow koy krk kro krr krs kru krw kry ksb ksk kso ksr kss ksu ksw kub kuk kur kus kuu kuy kw- kwk kwo kws kww kyo kyr kys kyu kyw ob- obb obk obo obr obs obu obw oby okb okk oko okr oks oku okw oo- oob ook ooo oor oos oow or- orb ork oro orr ors oru ory os- osb osk oso osr oss osu osw ou- ouk ouo our ous owb owk owo ows owu oww oyo oys rbb rbk rbo rbr rbs rbu rbw rkb rkk rko rks rku rky rob rok roo ror ros rou row roy rrb rrk rrr rrs rru rsb rsk rso rsr rss rsu rsw rub ruk ruo rur rus ruu ruy rwb rwr rws rwu rwy ry- ryk ryo ryr rys ryu ryy sbb sbk sbo sbr sbs sbu sbw sby sk- skb skk sko skr sks sku skw sky sob sok soo sor sos sou sow soy sr- srb srk sro srr srs srw sry ss- ssb ssk sso ssr sss ssu ssw sub suk suo sur sus suu suw suy swb swk swo swr sws swu swy sy- syb syk syr sys syu ubb ubk ubo ubr ubs ubu ubw uby ukb ukk ukr uku uob uok uoo uor uos uow ur- urb urk uro urr urs uru urw ury usb usk uso usr uss usu usw uur uus uuu uwb uwr uws uww uyo uys uyu wbb wbo wbr wbs wbw wkb wko wkr wks wkw wky wob wok woo wor wos wou wow woy wr- wrk wro wrr wrs wru wrw wry wsb wsk wso wsr wss wsu wsw wub wuo wur wus wwo wwu www wy- wyk wyo wyr wys ybr ybs yby ykk yob yok yoo yor yos you yow yoy yro yrs yru ysb ysk yso ysr yss ysu ysy yuk yuo yur yus yuu yuy yyb yys yyu yyy