-er ddd dde ddi ddp ddr de- ded dee dei dep der di- did die dii dip dir dpd dpe dpi dpp dpr drd dre dri drp drr ed- edd ede edi edp edr eed eee eep eer eid eie eii eip eir ep- epd epe epi epp epr erd ere eri erp err i-d idd ide idi idp idr ie- ied iee iei iep ier iid iie iii iip iir ipd ipe ipi ipp ipr ir- ird ire iri irp irr p-p pdd pde pdi pdp pdr ped pee pei pep per pid pie pii pip pir ppd ppe ppi ppp ppr prd pre pri prp prr rdd rde rdi rdp rdr re- red ree rei rep rer rid rie rii rip rir rpd rpe rpi rpp rpr rrd rri rrp rrr