-er -up ddd dde ddn ddp ddr ddu de- ded dee den dep der deu dnd dne dnn dnp dnr dpd dpe dpn dpp dpr dpu drd dre drn drp drr dru dud due dun dup dur ed- edd ede edn edp edr edu eed eee een eep eer en- end ene enn enp enr enu ep- epd epe epn epp epr epu erd ere ern erp err eru eu- eud eue eun eup eur ndd nde ndn ndp ndr ndu ne- ned nee nen nep ner neu nne nnn nnp nnu npd npe npn npp npr npu nrd nre nrn nrp nrr nru nud nue nun nup nur nuu p-p pdd pde pdn pdp pdr pdu ped pee pen pep per peu pn- pnd pne pnn pnp pnr pnu ppd ppe ppn ppp ppr ppu prd pre prn prp prr pru pud pue pun pup pur puu rdd rde rdn rdp rdr rdu re- red ree ren rep rer reu rnd rnn rnp rnr rnu rpd rpe rpn rpp rpr rpu rrd rrn rrp rrr rru rud rue run rup rur ruu udd ude udn udp udr udu ued uee uen uep uer un- und une unn unp unr unu up- upd upe upn upp upr upu ur- urd ure urn urp urr uru uue uun uur uuu