c-- ccc cco ccr ccu co- coc coo cor cou coy crc cro crr cru cry cuc cuo cur cuu cuy cyc cyo cyr oc- occ oco ocr ocu oo- ooc ooo oor or- orc oro orr oru ory ou- ouc ouo our oyo rcc rco rcr rcu roc roo ror rou roy rrc rrr rru ruc ruo rur ruu ruy ry- ryc ryo ryr ryu ryy ucc uco ucr ucu uoc uoo uor ur- urc uro urr uru ury uuc uur uuu uyc uyo uyu ycc yco ycu ycy yoc yoo yor you yoy yrc yro yru yuo yur yuu yuy yyc yyu yyy