c-- ccc ccm cco ccr ccz cmc cmm cmo cmr co- coc com coo cor coz crc crm cro crr crz cz- czc czm czo m-o m-r mc- mcc mcm mco mcr mcz mmc mmm mmo mmr mmz moc mom moo mor moz mrc mrm mro mrr mrz mzm oc- occ ocm oco ocr ocz om- omc omm omo omr omz oo- ooc oom ooo oor or- orc orm oro orr orz ozm ozo ozz rcc rcm rco rcr rmc rmm rmo rmr roc rom roo ror roz rrc rrm rrr rzm rzo zco zmc zmm zo- zoc zom zoo zor zro zzr zzz