kkk kkr kks kku kky kok koo kor kos kou koy krk kro krr krs kru kry ksk kso ksr kss ksu kuk kur kus kuu kuy kyo kyr kys kyu okk oko okr oks oku oo- ook ooo oor oos or- ork oro orr ors oru ory os- osk oso osr oss osu ou- ouk ouo our ous oyo oys rkk rko rks rku rky rok roo ror ros rou roy rrk rrr rrs rru rsk rso rsr rss rsu ruk ruo rur rus ruu ruy ry- ryk ryo ryr rys ryu ryy sk- skk sko skr sks sku sky sok soo sor sos sou soy sr- srk sro srr srs sry ss- ssk sso ssr sss ssu suk suo sur sus suu suy sy- syk syr sys syu ukk ukr uku uok uoo uor uos ur- urk uro urr urs uru ury usk uso usr uss usu uur uus uuu uyo uys uyu ykk yok yoo yor yos you yoy yro yrs yru ysk yso ysr yss ysu ysy yuk yuo yur yus yuu yuy yys yyu yyy