-er ddd dde ddf ddk ddo ddr dds de- ded dee def dek deo der des dfd dfe dff dfk dfo dfr dfs dke dkk dko dkr dks dod doe dof dok doo dor dos drd dre drk dro drr drs dsd dse dsf dsk dso dsr dss ed- edd ede edf edk edo edr eds eed eee eef eek eeo eer ees ef- efd efe eff efo efr efs ekd eke ekf eko ekr eks eo- eod eoe eof eok eoo eor eos erd ere erf erk ero err ers es- esd ese esf esk eso esr ess fdd fde fdf fdk fdo fdr fds fed fee fef fek feo fer fes ffd ffe fff ffk ffo ffr ffs fkf fkk foe fof fok foo for fos frd fre frf frk fro frr frs fsd fse fsf fsk fso fsr fss kde kdf kdk kdo kdr kds ke- ked kee kef kek keo ker kes kfd kff kfo kfs kke kkk kkr kks kod koe kof kok koo kor kos krd krf krk kro krr krs ksd kse ksf ksk kso ksr kss odd ode odf odo odr ods oed oee oef oeo oer oes of- ofd ofe off ofo ofr ofs okd oke okk oko okr oks oo- ood oof ook ooo oor oos or- ord ore orf ork oro orr ors os- osd ose osf osk oso osr oss rdd rde rdf rdo rdr rds re- red ree ref rek reo rer res rfd rfe rff rfk rfo rfr rfs rke rkf rkk rko rks rod roe rof rok roo ror ros rrd rrf rrk rrr rrs rsd rse rsf rsk rso rsr rss sdd sde sdf sdk sdo sdr sds se- sed see sef sek seo ser ses sfd sfe sff sfk sfo sfr sfs sk- skd ske skf skk sko skr sks sod soe sof sok soo sor sos sr- srd sre srf srk sro srr srs ss- ssd sse ssf ssk sso ssr sss