c-- ccc cch ccm cco ch- chc chh chm cho chy cmc cmh cmm cmo cmy co- coc coh com coo coy cyc cym cyo hcc hch hcm hco hcy hhc hhh hhm hho hhy hmc hmh hmm hmo hmy hoc hoh hom hoo hoy hy- hyc hyh hym hyo hyy m-o mc- mcc mch mcm mco mhc mhh mhm mho mmc mmh mmm mmo moc moh mom moo moy my- myc myh mym myo oc- occ och ocm oco ohc ohh ohm oho om- omc omh omm omo omy oo- ooc ooh oom ooo oyo ycc ych yco ycy yhc ymc ymm ymo yoc yom yoo yoy yyc yyy