c-- ccc cce ccm cco cct ccz ce- cec cee cem ceo cet cez cmc cme cmm cmo cmt co- coc coe com coo cot coz ctc cte ctm cto ctt ctz cz- czc cze czm czo czt ec- ecc ece ecm eco ect eec eee eem eeo eet em- emc eme emm emo emt eo- eoc eoe eom eoo eot etc ete etm eto ett etz eze ezo ezz m-o mc- mcc mce mcm mco mct mcz mec mee mem meo met mez mmc mme mmm mmo mmt mmz moc moe mom moo mot moz mtc mte mtm mto mtt mzm mzt oc- occ ocm oco oct ocz oec oee oem oeo oet om- omc ome omm omo omt omz oo- ooc oom ooo oot ot- otc ote otm oto ott otz oze ozm ozo ozt ozz tcc tce tcm tco tct te- tec tee tem teo tet tez tmc tme tmm tmo tmt tmz to- toc toe tom too tot toz ttc tte ttm tto ttt tze zce zco zec zee zem zeo zet zez zmc zmm zmt zo- zoc zoe zom zoo zot zte ztm zzt zzz