-er ddd dde ddi ddk ddr dds de- ded dee dei dek der des di- did die dii dik dir dis dke dki dkk dkr dks drd dre dri drk drr drs dsd dse dsi dsk dsr dss ed- edd ede edi edk edr eds eed eee eek eer ees eid eie eii eik eir eis ekd eke eki ekr eks erd ere eri erk err ers es- esd ese esi esk esr ess i-d idd ide idi idk idr ids ie- ied iee iei iek ier ies iid iie iii iir iis ike iki ikk ikr iks ir- ird ire iri irk irr irs is- isd ise isi isk isr iss kde kdk kdr kds ke- ked kee kei kek ker kes kid kie kii kik kir kis kke kki kkk kkr kks krd kri krk krr krs ksd kse ksi ksk ksr kss rdd rde rdi rdr rds re- red ree rei rek rer res rid rie rii rik rir ris rke rkk rks rrd rri rrk rrr rrs rsd rse rsi rsk rsr rss sdd sde sdi sdk sdr sds se- sed see sei sek ser ses sid sie sii sik sir sis sk- skd ske ski skk skr sks sr- srd sre sri srk srr srs ss- ssd sse ssi ssk ssr sss