c-- ccc ccm cco ccr cmc cmm cmo cmr cmy co- coc com coo cor coy crc crm cro crr cry cyc cym cyo cyr m-o m-r mc- mcc mcm mco mcr mmc mmm mmo mmr moc mom moo mor moy mrc mrm mro mrr mry my- myc mym myo myr oc- occ ocm oco ocr om- omc omm omo omr omy oo- ooc oom ooo oor or- orc orm oro orr ory oyo rcc rcm rco rcr rmc rmm rmo rmr roc rom roo ror roy rrc rrm rrr ry- ryc rym ryo ryr ryy ycc yco ycy ymc ymm ymo yoc yom yoo yor yoy yrc yro yyc yyy