-er -up ddd dde ddn ddp ddr dds ddu de- ded dee den dep der des deu dnd dne dnn dnp dnr dns dpd dpe dpn dpp dpr dps dpu drd dre drn drp drr drs dru dsd dse dsn dsp dsr dss dsu dud due dun dup dur dus ed- edd ede edn edp edr eds edu eed eee een eep eer ees en- end ene enn enp enr ens enu ep- epd epe epn epp epr eps epu erd ere ern erp err ers eru es- esd ese esn esp esr ess esu eu- eud eue eun eup eur eus ndd nde ndn ndp ndr nds ndu ne- ned nee nen nep ner nes neu nne nnn nnp nns nnu npd npe npn npp npr nps npu nrd nre nrn nrp nrr nrs nru nsd nse nsn nsp nsr nss nsu nud nue nun nup nur nus nuu p-p pdd pde pdn pdp pdr pds pdu ped pee pen pep per pes peu pn- pnd pne pnn pnp pnr pns pnu ppd ppe ppn ppp ppr pps ppu prd pre prn prp prr prs pru ps- psd pse psn psp psr pss psu pud pue pun pup pur pus puu rdd rde rdn rdp rdr rds rdu re- red ree ren rep rer res reu rnd rnn rnp rnr rns rnu rpd rpe rpn rpp rpr rps rpu rrd rrn rrp rrr rrs rru rsd rse rsn rsp rsr rss rsu rud rue run rup rur rus ruu sdd sde sdn sdp sdr sds sdu se- sed see sen sep ser ses seu snd sne snn snp snr sns snu spd spe spn spp spr sps spu sr- srd sre srn srp srr srs ss- ssd sse ssn ssp ssr sss ssu sud sue sun sup sur sus suu udd ude udn udp udr uds udu ued uee uen uep uer ues un- und une unn unp unr uns unu up- upd upe upn upp upr ups upu ur- urd ure urn urp urr urs uru usd use usn usp usr uss usu uue uun uur uus uuu