a-a a-b a-t aaa aab aam aas aat aax ab- aba abb abm abs abt abx ama amb amm ams amt amx as- asa asb asm ass ast asx at- ata atb atm ats att atx ax- axa axm axs axt axx baa bab bam bas bat bax bba bbb bbm bbs bbt bbx bma bmb bmm bms bmt bmx bsa bsb bsm bss bst bsx bta btb btm bts btt btx bxb bxm bxx maa mab mam mas mat max mba mbb mbm mbs mbt mbx mma mmb mmm mms mmt mmx msa msb msm mss mst msx mta mtb mtm mts mtt mtx mxa mxs saa sab sam sas sat sax sba sbb sbm sbs sbt sbx sma smb smm sms smt smx ss- ssa ssb ssm sss sst ssx sta stb stm sts stt stx sxm sxs sxt t-x taa tab tam tas tat tax tba tbb tbm tbs tbt tma tmb tmm tms tmt tmx tsa tsb tsm tss tst tsx tta ttb ttm tts ttt ttx txs txt xaa xam xas xat xbx xma xmm xms xmt xmx xsa xsb xsm xss xst xtm xts xtx xxx