a-a a-b a-t aaa aab aad aae aak aam aas aat ab- aba abb abd abe abk abm abs abt ad- ada adb add ade adk adm ads adt aea aeb aed aee aek aem aes aet aka akb akd ake akk akm aks ama amb amd ame amk amm ams amt as- asa asb asd ase ask asm ass ast at- ata atb atd ate atm ats att baa bab bad bae bak bam bas bat bba bbb bbd bbe bbk bbm bbs bbt bda bdb bdd bde bdk bdm bds bdt be- bea beb bed bee bek bem bes bet bka bkb bke bkk bkm bks bkt bma bmb bmd bme bmk bmm bms bmt bsa bsb bsd bse bsk bsm bss bst bta btb btd bte btk btm bts btt daa dab dad dae dak dam das dat dba dbb dbd dbe dbk dbm dbs dbt dda ddb ddd dde ddk ddm dds ddt de- dea deb ded dee dek dem des det dka dkb dke dkk dkm dks dkt dma dmb dmd dme dmk dmm dms dmt dsa dsb dsd dse dsk dsm dss dst dta dtb dtd dte dtk dtm dts dtt eaa eab ead eae eak eam eas eat eba ebb ebd ebe ebk ebm ebs ebt ed- eda edb edd ede edk edm eds edt eea eeb eed eee eek eem ees eet eka ekb ekd eke eks ekt em- ema emb emd eme emk emm ems emt es- esa esb esd ese esk esm ess est eta etb etd ete etk etm ets ett k-t ka- kaa kab kad kae kak kam kas kat kba kbb kbd kbe kbk kbm kbs kda kdb kde kdk kdm kds kdt ke- kea keb ked kee kek kem kes ket kkb kke kkk kkm kks kkt kma kmb kmd kme kmk kmm kms kmt ksa ksb ksd kse ksk ksm kss kst kta ktb kte ktk ktm kts ktt maa mab mad mae mak mam mas mat mba mbb mbd mbe mbk mbm mbs mbt mda mdb mdd mde mdk mdm mds mdt mea meb med mee mek mem mes met mka mkb mkd mke mkk mkm mks mkt mma mmb mmd mme mmk mmm mms mmt msa msb msd mse msk msm mss mst mta mtb mtd mte mtk mtm mts mtt saa sab sad sae sak sam sas sat sba sbb sbd sbe sbk sbm sbs sbt sda sdb sdd sde sdk sdm sds sdt se- sea seb sed see sek sem ses set sk- ska skb skd ske skk skm sks skt sma smb smd sme smk smm sms smt ss- ssa ssb ssd sse ssk ssm sss sst sta stb std ste stk stm sts stt taa tab tad tae tak tam tas tat tba tbb tbd tbe tbk tbm tbs tbt tda tdb tdd tde tdk tdm tds tdt te- tea teb ted tee tek tem tes tet tka tkb tke tkk tkm tks tkt tma tmb tmd tme tmk tmm tms tmt tsa tsb tsd tse tsk tsm tss tst tta ttb ttd tte ttk ttm tts ttt