-er a-a a-b aaa aab aad aae aak aam aar aas ab- aba abb abd abe abk abm abr abs ad- ada adb add ade adk adm adr ads aea aeb aed aee aek aem aer aes aka akb akd ake akk akm akr aks ama amb amd ame amk amm amr ams ar- ara arb ard are ark arm arr ars as- asa asb asd ase ask asm asr ass baa bab bad bae bak bam bar bas bba bbb bbd bbe bbk bbm bbr bbs bda bdb bdd bde bdk bdm bdr bds be- bea beb bed bee bek bem ber bes bka bkb bke bkk bkm bkr bks bma bmb bmd bme bmk bmm bmr bms bra brb brd bre brk brm brr brs bsa bsb bsd bse bsk bsm bsr bss daa dab dad dae dak dam dar das dba dbb dbd dbe dbk dbm dbr dbs dda ddb ddd dde ddk ddm ddr dds de- dea deb ded dee dek dem der des dka dkb dke dkk dkm dkr dks dma dmb dmd dme dmk dmm dmr dms dra drb drd dre drk drm drr drs dsa dsb dsd dse dsk dsm dsr dss eaa eab ead eae eak eam ear eas eba ebb ebd ebe ebk ebm ebr ebs ed- eda edb edd ede edk edm edr eds eea eeb eed eee eek eem eer ees eka ekb ekd eke ekr eks em- ema emb emd eme emk emm emr ems era erb erd ere erk erm err ers es- esa esb esd ese esk esm esr ess ka- kaa kab kad kae kak kam kar kas kba kbb kbd kbe kbk kbm kbr kbs kda kdb kde kdk kdm kdr kds ke- kea keb ked kee kek kem ker kes kkb kke kkk kkm kkr kks kma kmb kmd kme kmk kmm kms kra krd krk krr krs ksa ksb ksd kse ksk ksm ksr kss m-r maa mab mad mae mak mam mar mas mba mbb mbd mbe mbk mbm mbr mbs mda mdb mdd mde mdk mdm mdr mds mea meb med mee mek mem mer mes mka mkb mkd mke mkk mkm mkr mks mma mmb mmd mme mmk mmm mmr mms mra mrb mrd mre mrk mrm mrr mrs msa msb msd mse msk msm msr mss ra- raa rab rad rae rak ram rar ras rba rbb rbd rbe rbk rbm rbr rbs rda rdb rdd rde rdm rdr rds re- rea reb red ree rek rem rer res rkb rke rkk rkm rks rma rmb rmd rme rmm rmr rms rra rrb rrd rrk rrm rrr rrs rsa rsb rsd rse rsk rsm rsr rss saa sab sad sae sak sam sar sas sba sbb sbd sbe sbk sbm sbr sbs sda sdb sdd sde sdk sdm sdr sds se- sea seb sed see sek sem ser ses sk- ska skb skd ske skk skm skr sks sma smb smd sme smk smm smr sms sr- sra srb srd sre srk srm srr srs ss- ssa ssb ssd sse ssk ssm ssr sss