a-a a-b aaa aab aad aae aam aas ab- aba abb abd abe abm abs ad- ada adb add ade adm ads aea aeb aed aee aem aes ama amb amd ame amm ams as- asa asb asd ase asm ass baa bab bad bae bam bas bba bbb bbd bbe bbm bbs bda bdb bdd bde bdm bds be- bea beb bed bee bem bes bma bmb bmd bme bmm bms bsa bsb bsd bse bsm bss daa dab dad dae dam das dba dbb dbd dbe dbm dbs dda ddb ddd dde ddm dds de- dea deb ded dee dem des dma dmb dmd dme dmm dms dsa dsb dsd dse dsm dss eaa eab ead eae eam eas eba ebb ebd ebe ebm ebs ed- eda edb edd ede edm eds eea eeb eed eee eem ees em- ema emb emd eme emm ems es- esa esb esd ese esm ess maa mab mad mae mam mas mba mbb mbd mbe mbm mbs mda mdb mdd mde mdm mds mea meb med mee mem mes mma mmb mmd mme mmm mms msa msb msd mse msm mss saa sab sad sae sam sas sba sbb sbd sbe sbm sbs sda sdb sdd sde sdm sds se- sea seb sed see sem ses sma smb smd sme smm sms ss- ssa ssb ssd sse ssm sss