a-a a-b a-t aaa aab aad aae aam aan aas aat ab- aba abb abd abe abm abn abs abt ad- ada adb add ade adm adn ads adt aea aeb aed aee aem aen aes aet ama amb amd ame amm amn ams amt an- ana anb and ane anm ann ans ant as- asa asb asd ase asm asn ass ast at- ata atb atd ate atm atn ats att baa bab bad bae bam ban bas bat bba bbb bbd bbe bbm bbn bbs bbt bda bdb bdd bde bdm bds bdt be- bea beb bed bee bem ben bes bet bma bmb bmd bme bmm bmn bms bmt bna bnb bnd bne bnn bns bnt bsa bsb bsd bse bsm bsn bss bst bta btb btd bte btm btn bts btt daa dab dad dae dam dan das dat dba dbb dbd dbe dbm dbn dbs dbt dda ddb ddd dde ddm ddn dds ddt de- dea deb ded dee dem den des det dma dmb dmd dme dmm dmn dms dmt dna dnb dnd dne dnm dnn dns dnt dsa dsb dsd dse dsm dsn dss dst dta dtb dtd dte dtm dtn dts dtt eaa eab ead eae eam ean eas eat eba ebb ebd ebe ebm ebn ebs ebt ed- eda edb edd ede edm edn eds edt eea eeb eed eee eem een ees eet em- ema emb emd eme emm emn ems emt en- ena enb end ene enm enn ens ent es- esa esb esd ese esm esn ess est eta etb etd ete etm etn ets ett maa mab mad mae mam man mas mat mba mbb mbd mbe mbm mbs mbt mda mdb mdd mde mdm mdn mds mdt mea meb med mee mem men mes met mma mmb mmd mme mmm mmn mms mmt mna mnb mne mnm mnn mns mnt msa msb msd mse msm msn mss mst mta mtb mtd mte mtm mtn mts mtt naa nab nad nae nam nan nas nat nba nbb nbd nbe nbm nbn nbs nbt nda ndb ndd nde ndm ndn nds ndt ne- nea neb ned nee nem nen nes net nma nmb nmd nme nmm nmn nms nmt nna nnb nne nnm nnn nns nnt nsa nsb nsd nse nsm nsn nss nst nta ntb ntd nte ntm ntn nts ntt saa sab sad sae sam san sas sat sba sbb sbd sbe sbm sbn sbs sbt sda sdb sdd sde sdm sdn sds sdt se- sea seb sed see sem sen ses set sma smb smd sme smm smn sms smt sna snb snd sne snm snn sns snt ss- ssa ssb ssd sse ssm ssn sss sst sta stb std ste stm stn sts stt taa tab tad tae tam tan tas tat tba tbb tbd tbe tbm tbn tbs tbt tda tdb tdd tde tdm tdn tds tdt te- tea teb ted tee tem ten tes tet tma tmb tmd tme tmm tmn tms tmt tna tnb tnd tne tnm tnn tns tnt tsa tsb tsd tse tsm tsn tss tst tta ttb ttd tte ttm ttn tts ttt