-er ddd dde ddg ddk ddo ddp ddr de- ded dee deg dek deo dep der dgd dge dgg dgk dgp dgr dke dkg dkk dko dkp dkr dod doe dog dok doo dop dor dpd dpe dpg dpk dpo dpp dpr drd dre drg drk dro drp drr ed- edd ede edg edk edo edp edr eed eee eeg eek eeo eep eer egd ege egg ego egp egr ekd eke ekg eko ekp ekr eo- eod eoe eog eok eoo eop eor ep- epd epe epg epo epp epr erd ere erg erk ero erp err g-d g-p gdd gde gdk gdo gdp gdr ge- ged gee geg gek geo gep ger ggd ggg ggo ggp ggr gkd gko gkp god goe gog gok goo gop gor gpd gpe gpg gpk gpo gpp gpr grd gre grg grk gro grp grr kde kdg kdk kdo kdp kdr ke- ked kee keg kek keo kep ker kgd kgo kgp kke kkk kkp kkr kod koe kog kok koo kop kor kpd kpe kpk kpo kpp kpr krd krg krk kro krp krr odd ode odg odo odp odr oed oee oeg oeo oep oer ogd oge ogg ogo ogp okd oke okg okk oko okp okr oo- ood oog ook ooo oop oor op- opd ope opg opk opo opp opr or- ord ore org ork oro orp orr p-p pdd pde pdg pdk pdo pdp pdr ped pee peg pek peo pep per pgd pge pgg pgk pgo pgp pgr pkd pke pkg pko pkp pkr pod poe pog pok poo pop por ppd ppe ppg ppk ppo ppp ppr prd pre prg prk pro prp prr rdd rde rdg rdo rdp rdr re- red ree reg rek reo rep rer rgd rge rgg rgk rgo rgp rgr rke rkg rkk rko rkp rod roe rog rok roo rop ror rpd rpe rpg rpk rpo rpp rpr rrd rrg rrk rrp rrr