a-a a-c a-t aaa aac aae aam aas aat ac- aca acc ace acm acs act aea aec aee aem aes aet ama amc ame amm ams amt as- asa asc ase asm ass ast at- ata atc ate atm ats att c-- caa cac cae cam cas cat cca ccc cce ccm ccs cct ce- cea cec cee cem ces cet cma cmc cme cmm cms cmt csa csc cse csm css cst cta ctc cte ctm cts ctt eaa eac eae eam eas eat ec- eca ecc ece ecm ecs ect eea eec eee eem ees eet em- ema emc eme emm ems emt es- esa esc ese esm ess est eta etc ete etm ets ett maa mac mae mam mas mat mc- mca mcc mce mcm mcs mct mea mec mee mem mes met mma mmc mme mmm mms mmt msa msc mse msm mss mst mta mtc mte mtm mts mtt saa sac sae sam sas sat sca scc sce scm scs sct se- sea sec see sem ses set sma smc sme smm sms smt ss- ssa ssc sse ssm sss sst sta stc ste stm sts stt taa tac tae tam tas tat tca tcc tce tcm tcs tct te- tea tec tee tem tes tet tma tmc tme tmm tms tmt tsa tsc tse tsm tss tst tta ttc tte ttm tts ttt