-er ddd dde ddf ddi ddk ddo ddr de- ded dee def dei dek deo der dfd dfe dff dfi dfk dfo dfr di- did die dif dii dik dio dir dke dki dkk dko dkr dod doe dof doi dok doo dor drd dre dri drk dro drr ed- edd ede edf edi edk edo edr eed eee eef eek eeo eer ef- efd efe eff efi efo efr eid eie eif eii eik eio eir ekd eke ekf eki eko ekr eo- eod eoe eof eoi eok eoo eor erd ere erf eri erk ero err fdd fde fdf fdi fdk fdo fdr fed fee fef fei fek feo fer ffd ffe fff ffi ffk ffo ffr fid fie fif fii fik fir fkf fki fkk foe fof foi fok foo for frd fre frf fri frk fro frr i-d i-f idd ide idf idi idk ido idr ie- ied iee ief iei iek ier ifd ife iff ifi ifo ifr iid iie iif iii iio iir ike ikf iki ikk iko ikr io- iod ioe iof ioi ioo ior ir- ird ire irf iri irk iro irr kde kdf kdk kdo kdr ke- ked kee kef kei kek keo ker kfd kff kfi kfo kid kie kif kii kik kio kir kke kki kkk kkr kod koe kof koi kok koo kor krd krf kri krk kro krr o-i odd ode odf odi odo odr oed oee oef oei oeo oer of- ofd ofe off ofi ofo ofr oid oie oif oii oik oio oir okd oke oki okk oko okr oo- ood oof ooi ook ooo oor or- ord ore orf ori ork oro orr rdd rde rdf rdi rdo rdr re- red ree ref rei rek reo rer rfd rfe rff rfi rfk rfo rfr rid rie rif rii rik rio rir rke rkf rkk rko rod roe rof roi rok roo ror rrd rrf rri rrk rrr