-er ddd dde ddi ddk ddo ddp ddr de- ded dee dei dek deo dep der di- did die dii dik dio dip dir dke dki dkk dko dkp dkr dod doe doi dok doo dop dor dpd dpe dpi dpk dpo dpp dpr drd dre dri drk dro drp drr ed- edd ede edi edk edo edp edr eed eee eek eeo eep eer eid eie eii eik eio eip eir ekd eke eki eko ekp ekr eo- eod eoe eoi eok eoo eop eor ep- epd epe epi epo epp epr erd ere eri erk ero erp err i-d idd ide idi idk ido idp idr ie- ied iee iei iek iep ier iid iie iii iio iip iir ike iki ikk iko ikr io- iod ioe ioi ioo iop ior ipd ipe ipi ipo ipp ipr ir- ird ire iri irk iro irp irr kde kdk kdo kdp kdr ke- ked kee kei kek keo kep ker kid kie kii kik kio kip kir kke kki kkk kkp kkr kod koe koi kok koo kop kor kpd kpe kpi kpk kpo kpp kpr krd kri krk kro krp krr o-i odd ode odi odo odp odr oed oee oei oeo oep oer oid oie oii oik oio oip oir okd oke oki okk oko okp okr oo- ood ooi ook ooo oop oor op- opd ope opi opk opo opp opr or- ord ore ori ork oro orp orr p-p pdd pde pdi pdk pdo pdp pdr ped pee pei pek peo pep per pid pie pii pik pio pip pir pkd pke pki pko pkp pkr pod poe poi pok poo pop por ppd ppe ppi ppk ppo ppp ppr prd pre pri prk pro prp prr rdd rde rdi rdo rdp rdr re- red ree rei rek reo rep rer rid rie rii rik rio rip rir rke rkk rko rkp rod roe roi rok roo rop ror rpd rpe rpi rpk rpo rpp rpr rrd rri rrk rrp rrr