kkk kkr kku kkv kky kok koo kor kou koy krk kro krr kru krv kry kuk kur kuu kuy kvk kvo kvr kvv kyo kyr kyu okk oko okr oku oo- ook ooo oor oov or- ork oro orr oru orv ory ou- ouk ouo our ov- ovo ovv oyo rkk rko rku rkv rky rok roo ror rou rov roy rrk rrr rru ruk ruo rur ruu ruv ruy rvo rvr rvu rvv rvy ry- ryk ryo ryr ryu ryy ukk ukr uku uok uoo uor ur- urk uro urr uru ury uur uuu uvo uvu uvv uyo uyu vok voo vor vou vov voy vrk vrr vru vry vuk vur vuv vvo vvr vvv ykk yok yoo yor you yoy yro yru yuk yuo yur yuu yuv yuy yvo yvr yvy yyu yyy