a-a a-c a-t aaa aac aae aam aat ac- aca acc ace acm act aea aec aee aem aet ama amc ame amm amt at- ata atc ate atm att c-- caa cac cae cam cat cca ccc cce ccm cct ce- cea cec cee cem cet cma cmc cme cmm cmt cta ctc cte ctm ctt eaa eac eae eam eat ec- eca ecc ece ecm ect eea eec eee eem eet em- ema emc eme emm emt eta etc ete etm ett maa mac mae mam mat mc- mca mcc mce mcm mct mea mec mee mem met mma mmc mme mmm mmt mta mtc mte mtm mtt taa tac tae tam tat tca tcc tce tcm tct te- tea tec tee tem tet tma tmc tme tmm tmt tta ttc tte ttm ttt