-er ddd dde ddn ddo ddp ddr dds de- ded dee den deo dep der des dnd dne dnn dno dnp dnr dns dod doe don doo dop dor dos dpd dpe dpn dpo dpp dpr dps drd dre drn dro drp drr drs dsd dse dsn dso dsp dsr dss ed- edd ede edn edo edp edr eds eed eee een eeo eep eer ees en- end ene enn eno enp enr ens eo- eod eoe eon eoo eop eor eos ep- epd epe epn epo epp epr eps erd ere ern ero erp err ers es- esd ese esn eso esp esr ess ndd nde ndn ndo ndp ndr nds ne- ned nee nen neo nep ner nes nne nnn nno nnp nns no- nod noe non noo nop nor nos npd npe npn npo npp npr nps nrd nre nrn nro nrp nrr nrs nsd nse nsn nso nsp nsr nss odd ode odn odo odp odr ods oed oee oen oeo oep oer oes on- ond one onn ono onp onr ons oo- ood oon ooo oop oor oos op- opd ope opn opo opp opr ops or- ord ore orn oro orp orr ors os- osd ose osn oso osp osr oss p-p pdd pde pdn pdo pdp pdr pds ped pee pen peo pep per pes pn- pnd pne pnn pno pnp pnr pns pod poe pon poo pop por pos ppd ppe ppn ppo ppp ppr pps prd pre prn pro prp prr prs ps- psd pse psn pso psp psr pss rdd rde rdn rdo rdp rdr rds re- red ree ren reo rep rer res rnd rnn rno rnp rnr rns rod roe ron roo rop ror ros rpd rpe rpn rpo rpp rpr rps rrd rrn rrp rrr rrs rsd rse rsn rso rsp rsr rss sdd sde sdn sdo sdp sdr sds se- sed see sen seo sep ser ses snd sne snn sno snp snr sns sod soe son soo sop sor sos spd spe spn spo spp spr sps sr- srd sre srn sro srp srr srs ss- ssd sse ssn sso ssp ssr sss