-er ddd dde ddn ddp ddr de- ded dee den dep der dnd dne dnn dnp dnr dpd dpe dpn dpp dpr drd dre drn drp drr ed- edd ede edn edp edr eed eee een eep eer en- end ene enn enp enr ep- epd epe epn epp epr erd ere ern erp err ndd nde ndn ndp ndr ne- ned nee nen nep ner nne nnn nnp npd npe npn npp npr nrd nre nrn nrp nrr p-p pdd pde pdn pdp pdr ped pee pen pep per pn- pnd pne pnn pnp pnr ppd ppe ppn ppp ppr prd pre prn prp prr rdd rde rdn rdp rdr re- red ree ren rep rer rnd rnn rnp rnr rpd rpe rpn rpp rpr rrd rrn rrp rrr