-er ddd dde ddf ddi ddk ddr de- ded dee def dei dek der dfd dfe dff dfi dfk dfr di- did die dif dii dik dir dke dki dkk dkr drd dre dri drk drr ed- edd ede edf edi edk edr eed eee eef eek eer ef- efd efe eff efi efr eid eie eif eii eik eir ekd eke ekf eki ekr erd ere erf eri erk err fdd fde fdf fdi fdk fdr fed fee fef fei fek fer ffd ffe fff ffi ffk ffr fid fie fif fii fik fir fkf fki fkk frd fre frf fri frk frr i-d i-f idd ide idf idi idk idr ie- ied iee ief iei iek ier ifd ife iff ifi ifr iid iie iif iii iir ike ikf iki ikk ikr ir- ird ire irf iri irk irr kde kdf kdk kdr ke- ked kee kef kei kek ker kfd kff kfi kid kie kif kii kik kir kke kki kkk kkr krd krf kri krk krr rdd rde rdf rdi rdr re- red ree ref rei rek rer rfd rfe rff rfi rfk rfr rid rie rif rii rik rir rke rkf rkk rrd rrf rri rrk rrr