-er ddd dde ddf ddi ddk ddr dds de- ded dee def dei dek der des dfd dfe dff dfi dfk dfr dfs di- did die dif dii dik dir dis dke dki dkk dkr dks drd dre dri drk drr drs dsd dse dsf dsi dsk dsr dss ed- edd ede edf edi edk edr eds eed eee eef eek eer ees ef- efd efe eff efi efr efs eid eie eif eii eik eir eis ekd eke ekf eki ekr eks erd ere erf eri erk err ers es- esd ese esf esi esk esr ess fdd fde fdf fdi fdk fdr fds fed fee fef fei fek fer fes ffd ffe fff ffi ffk ffr ffs fid fie fif fii fik fir fis fkf fki fkk frd fre frf fri frk frr frs fsd fse fsf fsi fsk fsr fss i-d i-f idd ide idf idi idk idr ids ie- ied iee ief iei iek ier ies ifd ife iff ifi ifr ifs iid iie iif iii iir iis ike ikf iki ikk ikr iks ir- ird ire irf iri irk irr irs is- isd ise isf isi isk isr iss kde kdf kdk kdr kds ke- ked kee kef kei kek ker kes kfd kff kfi kfs kid kie kif kii kik kir kis kke kki kkk kkr kks krd krf kri krk krr krs ksd kse ksf ksi ksk ksr kss rdd rde rdf rdi rdr rds re- red ree ref rei rek rer res rfd rfe rff rfi rfk rfr rfs rid rie rif rii rik rir ris rke rkf rkk rks rrd rrf rri rrk rrr rrs rsd rse rsf rsi rsk rsr rss sdd sde sdf sdi sdk sdr sds se- sed see sef sei sek ser ses sfd sfe sff sfi sfk sfr sfs sid sie sif sii sik sir sis sk- skd ske skf ski skk skr sks sr- srd sre srf sri srk srr srs ss- ssd sse ssf ssi ssk ssr sss