a-a a-c a-t aaa aac aam aas aat aax ac- aca acc acm acs act acx ama amc amm ams amt amx as- asa asc asm ass ast asx at- ata atc atm ats att atx ax- axa axm axs axt axx c-- caa cac cam cas cat cax cca ccc ccm ccs cct ccx cma cmc cmm cms cmt cmx csa csc csm css cst csx cta ctc ctm cts ctt ctx cxc cxs cxt cxx maa mac mam mas mat max mc- mca mcc mcm mcs mct mcx mma mmc mmm mms mmt mmx msa msc msm mss mst msx mta mtc mtm mts mtt mtx mxa mxc mxs saa sac sam sas sat sax sca scc scm scs sct scx sma smc smm sms smt smx ss- ssa ssc ssm sss sst ssx sta stc stm sts stt stx sxc sxm sxs sxt t-x taa tac tam tas tat tax tca tcc tcm tcs tct tcx tma tmc tmm tms tmt tmx tsa tsc tsm tss tst tsx tta ttc ttm tts ttt ttx txs txt xaa xac xam xas xat xcx xma xmc xmm xms xmt xmx xsa xsc xsm xss xst xtc xtm xts xtx xxx