-er ddd dde ddk ddm ddr dds de- ded dee dek dem der des dke dkk dkm dkr dks dmd dme dmk dmm dmr dms drd dre drk drm drr drs dsd dse dsk dsm dsr dss ed- edd ede edk edm edr eds eed eee eek eem eer ees ekd eke ekr eks em- emd eme emk emm emr ems erd ere erk erm err ers es- esd ese esk esm esr ess kde kdk kdm kdr kds ke- ked kee kek kem ker kes kke kkk kkm kkr kks kmd kme kmk kmm kms krd krk krr krs ksd kse ksk ksm ksr kss m-r mdd mde mdk mdm mdr mds med mee mek mem mer mes mkd mke mkk mkm mkr mks mmd mme mmk mmm mmr mms mrd mre mrk mrm mrr mrs msd mse msk msm msr mss rdd rde rdm rdr rds re- red ree rek rem rer res rke rkk rkm rks rmd rme rmm rmr rms rrd rrk rrm rrr rrs rsd rse rsk rsm rsr rss sdd sde sdk sdm sdr sds se- sed see sek sem ser ses sk- skd ske skk skm skr sks smd sme smk smm smr sms sr- srd sre srk srm srr srs ss- ssd sse ssk ssm ssr sss