-er ddd dde ddk ddp ddr de- ded dee dek dep der dke dkk dkp dkr dpd dpe dpk dpp dpr drd dre drk drp drr ed- edd ede edk edp edr eed eee eek eep eer ekd eke ekp ekr ep- epd epe epp epr erd ere erk erp err kde kdk kdp kdr ke- ked kee kek kep ker kke kkk kkp kkr kpd kpe kpk kpp kpr krd krk krp krr p-p pdd pde pdk pdp pdr ped pee pek pep per pkd pke pkp pkr ppd ppe ppk ppp ppr prd pre prk prp prr rdd rde rdp rdr re- red ree rek rep rer rke rkk rkp rpd rpe rpk rpp rpr rrd rrk rrp rrr