a-a a-b a-t aaa aab aad aae aam aao aas aat ab- aba abb abd abe abm abo abs abt ad- ada adb add ade adm ado ads adt aea aeb aed aee aem aeo aes aet ama amb amd ame amm amo ams amt aoa aob aod aoe aom aoo aos aot as- asa asb asd ase asm aso ass ast at- ata atb atd ate atm ato ats att baa bab bad bae bam bao bas bat bba bbb bbd bbe bbm bbo bbs bbt bda bdb bdd bde bdm bdo bds bdt be- bea beb bed bee bem beo bes bet bma bmb bmd bme bmm bmo bms bmt boa bob bod boe bom boo bos bot bsa bsb bsd bse bsm bso bss bst bta btb btd bte btm bto bts btt daa dab dad dae dam dao das dat dba dbb dbd dbe dbm dbo dbs dbt dda ddb ddd dde ddm ddo dds ddt de- dea deb ded dee dem deo des det dma dmb dmd dme dmm dmo dms dmt doa dob dod doe dom doo dos dot dsa dsb dsd dse dsm dso dss dst dta dtb dtd dte dtm dto dts dtt eaa eab ead eae eam eao eas eat eba ebb ebd ebe ebm ebo ebs ebt ed- eda edb edd ede edm edo eds edt eea eeb eed eee eem eeo ees eet em- ema emb emd eme emm emo ems emt eo- eoa eob eod eoe eom eoo eos eot es- esa esb esd ese esm eso ess est eta etb etd ete etm eto ets ett m-o maa mab mad mae mam mao mas mat mba mbb mbd mbe mbm mbo mbs mbt mda mdb mdd mde mdm mdo mds mdt mea meb med mee mem meo mes met mma mmb mmd mme mmm mmo mms mmt moa mob mod moe mom moo mos mot msa msb msd mse msm mso mss mst mta mtb mtd mte mtm mto mts mtt oaa oab oad oae oam oao oas oat ob- oba obb obd obe obm obo obs obt oda odb odd ode odm odo ods odt oea oeb oed oee oem oeo oes oet om- oma omb omd ome omm omo oms omt oo- ooa oob ood oom ooo oos oot os- osa osb osd ose osm oso oss ost ot- ota otb otd ote otm oto ots ott saa sab sad sae sam sao sas sat sba sbb sbd sbe sbm sbo sbs sbt sda sdb sdd sde sdm sdo sds sdt se- sea seb sed see sem seo ses set sma smb smd sme smm smo sms smt soa sob sod soe som soo sos sot ss- ssa ssb ssd sse ssm sso sss sst sta stb std ste stm sto sts stt taa tab tad tae tam tao tas tat tba tbb tbd tbe tbm tbo tbs tbt tda tdb tdd tde tdm tdo tds tdt te- tea teb ted tee tem teo tes tet tma tmb tmd tme tmm tmo tms tmt to- toa tob tod toe tom too tos tot tsa tsb tsd tse tsm tso tss tst tta ttb ttd tte ttm tto tts ttt