a-a a-b a-t aaa aab aad aae aam aas aat ab- aba abb abd abe abm abs abt ad- ada adb add ade adm ads adt aea aeb aed aee aem aes aet ama amb amd ame amm ams amt as- asa asb asd ase asm ass ast at- ata atb atd ate atm ats att baa bab bad bae bam bas bat bba bbb bbd bbe bbm bbs bbt bda bdb bdd bde bdm bds bdt be- bea beb bed bee bem bes bet bma bmb bmd bme bmm bms bmt bsa bsb bsd bse bsm bss bst bta btb btd bte btm bts btt daa dab dad dae dam das dat dba dbb dbd dbe dbm dbs dbt dda ddb ddd dde ddm dds ddt de- dea deb ded dee dem des det dma dmb dmd dme dmm dms dmt dsa dsb dsd dse dsm dss dst dta dtb dtd dte dtm dts dtt eaa eab ead eae eam eas eat eba ebb ebd ebe ebm ebs ebt ed- eda edb edd ede edm eds edt eea eeb eed eee eem ees eet em- ema emb emd eme emm ems emt es- esa esb esd ese esm ess est eta etb etd ete etm ets ett maa mab mad mae mam mas mat mba mbb mbd mbe mbm mbs mbt mda mdb mdd mde mdm mds mdt mea meb med mee mem mes met mma mmb mmd mme mmm mms mmt msa msb msd mse msm mss mst mta mtb mtd mte mtm mts mtt saa sab sad sae sam sas sat sba sbb sbd sbe sbm sbs sbt sda sdb sdd sde sdm sds sdt se- sea seb sed see sem ses set sma smb smd sme smm sms smt ss- ssa ssb ssd sse ssm sss sst sta stb std ste stm sts stt taa tab tad tae tam tas tat tba tbb tbd tbe tbm tbs tbt tda tdb tdd tde tdm tds tdt te- tea teb ted tee tem tes tet tma tmb tmd tme tmm tms tmt tsa tsb tsd tse tsm tss tst tta ttb ttd tte ttm tts ttt