c-- ccc ccm cco ccv cmc cmm cmo cmv cmy co- coc com coo cov coy cvc cvm cvo cvv cyc cym cyo m-o m-v mc- mcc mcm mco mcv mmc mmm mmo mmv moc mom moo mov moy mvc mvm mvo mvv mvy my- myc mym myo myv oc- occ ocm oco ocv om- omc omm omo omv omy oo- ooc oom ooo oov ov- ovc ovo ovv oyo vcc vcm vco vcy vm- vmc vmm vmo voc vom voo vov voy vvc vvm vvo vvv vym ycc yco ycv ycy ymc ymm ymo yoc yom yoo yoy yvo yvy yyc yyy