-er ddd dde ddi ddo ddp ddr de- ded dee dei deo dep der di- did die dii dio dip dir dod doe doi doo dop dor dpd dpe dpi dpo dpp dpr drd dre dri dro drp drr ed- edd ede edi edo edp edr eed eee eeo eep eer eid eie eii eio eip eir eo- eod eoe eoi eoo eop eor ep- epd epe epi epo epp epr erd ere eri ero erp err i-d idd ide idi ido idp idr ie- ied iee iei iep ier iid iie iii iio iip iir io- iod ioe ioi ioo iop ior ipd ipe ipi ipo ipp ipr ir- ird ire iri iro irp irr o-i odd ode odi odo odp odr oed oee oei oeo oep oer oid oie oii oio oip oir oo- ood ooi ooo oop oor op- opd ope opi opo opp opr or- ord ore ori oro orp orr p-p pdd pde pdi pdo pdp pdr ped pee pei peo pep per pid pie pii pio pip pir pod poe poi poo pop por ppd ppe ppi ppo ppp ppr prd pre pri pro prp prr rdd rde rdi rdo rdp rdr re- red ree rei reo rep rer rid rie rii rio rip rir rod roe roi roo rop ror rpd rpe rpi rpo rpp rpr rrd rri rrp rrr