a-a a-c a-t aaa aac aam aas aat ac- aca acc acm acs act ama amc amm ams amt as- asa asc asm ass ast at- ata atc atm ats att c-- caa cac cam cas cat cca ccc ccm ccs cct cma cmc cmm cms cmt csa csc csm css cst cta ctc ctm cts ctt maa mac mam mas mat mc- mca mcc mcm mcs mct mma mmc mmm mms mmt msa msc msm mss mst mta mtc mtm mts mtt saa sac sam sas sat sca scc scm scs sct sma smc smm sms smt ss- ssa ssc ssm sss sst sta stc stm sts stt taa tac tam tas tat tca tcc tcm tcs tct tma tmc tmm tms tmt tsa tsc tsm tss tst tta ttc ttm tts ttt