-er ddd dde ddn ddo ddp ddr de- ded dee den deo dep der dnd dne dnn dno dnp dnr dod doe don doo dop dor dpd dpe dpn dpo dpp dpr drd dre drn dro drp drr ed- edd ede edn edo edp edr eed eee een eeo eep eer en- end ene enn eno enp enr eo- eod eoe eon eoo eop eor ep- epd epe epn epo epp epr erd ere ern ero erp err ndd nde ndn ndo ndp ndr ne- ned nee nen neo nep ner nne nnn nno nnp no- nod noe non noo nop nor npd npe npn npo npp npr nrd nre nrn nro nrp nrr odd ode odn odo odp odr oed oee oen oeo oep oer on- ond one onn ono onp onr oo- ood oon ooo oop oor op- opd ope opn opo opp opr or- ord ore orn oro orp orr p-p pdd pde pdn pdo pdp pdr ped pee pen peo pep per pn- pnd pne pnn pno pnp pnr pod poe pon poo pop por ppd ppe ppn ppo ppp ppr prd pre prn pro prp prr rdd rde rdn rdo rdp rdr re- red ree ren reo rep rer rnd rnn rno rnp rnr rod roe ron roo rop ror rpd rpe rpn rpo rpp rpr rrd rrn rrp rrr