a-a a-c a-t a-z aaa aac aae aam aat aaz ac- aca acc ace acm act acz aea aec aee aem aet aez ama amc ame amm amt amz at- ata atc ate atm att atz az- aza aze azm azt azz c-- caa cac cae cam cat caz cca ccc cce ccm cct ccz ce- cea cec cee cem cet cez cma cmc cme cmm cmt cta ctc cte ctm ctt ctz cz- czc cze czm czt eaa eac eae eam eat eaz ec- eca ecc ece ecm ect eea eec eee eem eet em- ema emc eme emm emt eta etc ete etm ett etz eze ezz maa mac mae mam mat maz mc- mca mcc mce mcm mct mcz mea mec mee mem met mez mma mmc mme mmm mmt mmz mta mtc mte mtm mtt mza mzm mzt taa tac tae tam tat taz tca tcc tce tcm tct te- tea tec tee tem tet tez tma tmc tme tmm tmt tmz tta ttc tte ttm ttt tza tze zaa zac zam zat zaz zce zea zec zee zem zet zez zma zmc zmm zmt zta zte ztm zzt zzz