-er ddd dde ddf ddk ddo ddp ddr de- ded dee def dek deo dep der dfd dfe dff dfk dfo dfp dfr dke dkk dko dkp dkr dod doe dof dok doo dop dor dpd dpe dpf dpk dpo dpp dpr drd dre drk dro drp drr ed- edd ede edf edk edo edp edr eed eee eef eek eeo eep eer ef- efd efe eff efo efp efr ekd eke ekf eko ekp ekr eo- eod eoe eof eok eoo eop eor ep- epd epe epf epo epp epr erd ere erf erk ero erp err fdd fde fdf fdk fdo fdp fdr fed fee fef fek feo fep fer ffd ffe fff ffk ffo ffp ffr fkf fkk fkp foe fof fok foo fop for fpd fpe fpk fpo fpp fpr frd fre frf frk fro frp frr kde kdf kdk kdo kdp kdr ke- ked kee kef kek keo kep ker kfd kff kfo kke kkk kkp kkr kod koe kof kok koo kop kor kpd kpe kpf kpk kpo kpp kpr krd krf krk kro krp krr odd ode odf odo odp odr oed oee oef oeo oep oer of- ofd ofe off ofo ofp ofr okd oke okk oko okp okr oo- ood oof ook ooo oop oor op- opd ope opf opk opo opp opr or- ord ore orf ork oro orp orr p-p pdd pde pdf pdk pdo pdp pdr ped pee pef pek peo pep per pfd pfe pff pfk pfo pfp pfr pkd pke pkf pko pkp pkr pod poe pof pok poo pop por ppd ppe ppf ppk ppo ppp ppr prd pre prf prk pro prp prr rdd rde rdf rdo rdp rdr re- red ree ref rek reo rep rer rfd rfe rff rfk rfo rfp rfr rke rkf rkk rko rkp rod roe rof rok roo rop ror rpd rpe rpf rpk rpo rpp rpr rrd rrf rrk rrp rrr