-er ddd dde ddi ddk ddp ddr de- ded dee dei dek dep der di- did die dii dik dip dir dke dki dkk dkp dkr dpd dpe dpi dpk dpp dpr drd dre dri drk drp drr ed- edd ede edi edk edp edr eed eee eek eep eer eid eie eii eik eip eir ekd eke eki ekp ekr ep- epd epe epi epp epr erd ere eri erk erp err i-d idd ide idi idk idp idr ie- ied iee iei iek iep ier iid iie iii iip iir ike iki ikk ikr ipd ipe ipi ipp ipr ir- ird ire iri irk irp irr kde kdk kdp kdr ke- ked kee kei kek kep ker kid kie kii kik kip kir kke kki kkk kkp kkr kpd kpe kpi kpk kpp kpr krd kri krk krp krr p-p pdd pde pdi pdk pdp pdr ped pee pei pek pep per pid pie pii pik pip pir pkd pke pki pkp pkr ppd ppe ppi ppk ppp ppr prd pre pri prk prp prr rdd rde rdi rdp rdr re- red ree rei rek rep rer rid rie rii rik rip rir rke rkk rkp rpd rpe rpi rpk rpp rpr rrd rri rrk rrp rrr