-er a-a a-b aaa aab aad aae aam aar aas ab- aba abb abd abe abm abr abs ad- ada adb add ade adm adr ads aea aeb aed aee aem aer aes ama amb amd ame amm amr ams ar- ara arb ard are arm arr ars as- asa asb asd ase asm asr ass baa bab bad bae bam bar bas bba bbb bbd bbe bbm bbr bbs bda bdb bdd bde bdm bdr bds be- bea beb bed bee bem ber bes bma bmb bmd bme bmm bmr bms bra brb brd bre brm brr brs bsa bsb bsd bse bsm bsr bss daa dab dad dae dam dar das dba dbb dbd dbe dbm dbr dbs dda ddb ddd dde ddm ddr dds de- dea deb ded dee dem der des dma dmb dmd dme dmm dmr dms dra drb drd dre drm drr drs dsa dsb dsd dse dsm dsr dss eaa eab ead eae eam ear eas eba ebb ebd ebe ebm ebr ebs ed- eda edb edd ede edm edr eds eea eeb eed eee eem eer ees em- ema emb emd eme emm emr ems era erb erd ere erm err ers es- esa esb esd ese esm esr ess m-r maa mab mad mae mam mar mas mba mbb mbd mbe mbm mbr mbs mda mdb mdd mde mdm mdr mds mea meb med mee mem mer mes mma mmb mmd mme mmm mmr mms mra mrb mrd mre mrm mrr mrs msa msb msd mse msm msr mss ra- raa rab rad rae ram rar ras rba rbb rbd rbe rbm rbr rbs rda rdb rdd rde rdm rdr rds re- rea reb red ree rem rer res rma rmb rmd rme rmm rmr rms rra rrb rrd rrm rrr rrs rsa rsb rsd rse rsm rsr rss saa sab sad sae sam sar sas sba sbb sbd sbe sbm sbr sbs sda sdb sdd sde sdm sdr sds se- sea seb sed see sem ser ses sma smb smd sme smm smr sms sr- sra srb srd sre srm srr srs ss- ssa ssb ssd sse ssm ssr sss