a-a a-c a-t aaa aac aae aam aat aax ac- aca acc ace acm act acx aea aec aee aem aet aex ama amc ame amm amt amx at- ata atc ate atm att atx ax- axa axe axm axt axx c-- caa cac cae cam cat cax cca ccc cce ccm cct ccx ce- cea cec cee cem cet cex cma cmc cme cmm cmt cmx cta ctc cte ctm ctt ctx cxc cxt cxx eaa eac eae eam eat eax ec- eca ecc ece ecm ect ecx eea eec eee eem eet eex em- ema emc eme emm emt emx eta etc ete etm ett etx ex- exa exc exe ext exx maa mac mae mam mat max mc- mca mcc mce mcm mct mcx mea mec mee mem met mex mma mmc mme mmm mmt mmx mta mtc mte mtm mtt mtx mxa mxc t-x taa tac tae tam tat tax tca tcc tce tcm tct tcx te- tea tec tee tem tet tex tma tmc tme tmm tmt tmx tta ttc tte ttm ttt ttx txe txt xaa xac xam xat xcx xee xem xet xex xma xmc xmm xmt xmx xtc xtm xtx xxx