a-a a-b aaa aab aad aae aak aam aas ab- aba abb abd abe abk abm abs ad- ada adb add ade adk adm ads aea aeb aed aee aek aem aes aka akb akd ake akk akm aks ama amb amd ame amk amm ams as- asa asb asd ase ask asm ass baa bab bad bae bak bam bas bba bbb bbd bbe bbk bbm bbs bda bdb bdd bde bdk bdm bds be- bea beb bed bee bek bem bes bka bkb bke bkk bkm bks bma bmb bmd bme bmk bmm bms bsa bsb bsd bse bsk bsm bss daa dab dad dae dak dam das dba dbb dbd dbe dbk dbm dbs dda ddb ddd dde ddk ddm dds de- dea deb ded dee dek dem des dka dkb dke dkk dkm dks dma dmb dmd dme dmk dmm dms dsa dsb dsd dse dsk dsm dss eaa eab ead eae eak eam eas eba ebb ebd ebe ebk ebm ebs ed- eda edb edd ede edk edm eds eea eeb eed eee eek eem ees eka ekb ekd eke eks em- ema emb emd eme emk emm ems es- esa esb esd ese esk esm ess ka- kaa kab kad kae kak kam kas kba kbb kbd kbe kbk kbm kbs kda kdb kde kdk kdm kds ke- kea keb ked kee kek kem kes kkb kke kkk kkm kks kma kmb kmd kme kmk kmm kms ksa ksb ksd kse ksk ksm kss maa mab mad mae mak mam mas mba mbb mbd mbe mbk mbm mbs mda mdb mdd mde mdk mdm mds mea meb med mee mek mem mes mka mkb mkd mke mkk mkm mks mma mmb mmd mme mmk mmm mms msa msb msd mse msk msm mss saa sab sad sae sak sam sas sba sbb sbd sbe sbk sbm sbs sda sdb sdd sde sdk sdm sds se- sea seb sed see sek sem ses sk- ska skb skd ske skk skm sks sma smb smd sme smk smm sms ss- ssa ssb ssd sse ssk ssm sss