-er ddd dde ddi ddn ddo ddp ddr dds de- ded dee dei den deo dep der des di- did die dii din dio dip dir dis dnd dne dni dnn dno dnp dnr dns dod doe doi don doo dop dor dos dpd dpe dpi dpn dpo dpp dpr dps drd dre dri drn dro drp drr drs dsd dse dsi dsn dso dsp dsr dss ed- edd ede edi edn edo edp edr eds eed eee een eeo eep eer ees eid eie eii ein eio eip eir eis en- end ene eni enn eno enp enr ens eo- eod eoe eoi eon eoo eop eor eos ep- epd epe epi epn epo epp epr eps erd ere eri ern ero erp err ers es- esd ese esi esn eso esp esr ess i-d idd ide idi idn ido idp idr ids ie- ied iee iei ien iep ier ies iid iie iii iin iio iip iir iis in- ind ine ini inn ino inp inr ins io- iod ioe ioi ion ioo iop ior ios ipd ipe ipi ipn ipo ipp ipr ips ir- ird ire iri irn iro irp irr irs is- isd ise isi isn iso isp isr iss n-i ndd nde ndi ndn ndo ndp ndr nds ne- ned nee nei nen neo nep ner nes nid nie nii nin nio nip nir nis nne nni nnn nno nnp nns no- nod noe noi non noo nop nor nos npd npe npi npn npo npp npr nps nrd nre nri nrn nro nrp nrr nrs nsd nse nsi nsn nso nsp nsr nss o-i odd ode odi odn odo odp odr ods oed oee oei oen oeo oep oer oes oid oie oii oin oio oip oir ois on- ond one oni onn ono onp onr ons oo- ood ooi oon ooo oop oor oos op- opd ope opi opn opo opp opr ops or- ord ore ori orn oro orp orr ors os- osd ose osi osn oso osp osr oss p-p pdd pde pdi pdn pdo pdp pdr pds ped pee pei pen peo pep per pes pid pie pii pin pio pip pir pis pn- pnd pne pni pnn pno pnp pnr pns pod poe poi pon poo pop por pos ppd ppe ppi ppn ppo ppp ppr pps prd pre pri prn pro prp prr prs ps- psd pse psi psn pso psp psr pss rdd rde rdi rdn rdo rdp rdr rds re- red ree rei ren reo rep rer res rid rie rii rin rio rip rir ris rnd rni rnn rno rnp rnr rns rod roe roi ron roo rop ror ros rpd rpe rpi rpn rpo rpp rpr rps rrd rri rrn rrp rrr rrs rsd rse rsi rsn rso rsp rsr rss sdd sde sdi sdn sdo sdp sdr sds se- sed see sei sen seo sep ser ses sid sie sii sin sio sip sir sis snd sne sni snn sno snp snr sns sod soe soi son soo sop sor sos spd spe spi spn spo spp spr sps sr- srd sre sri srn sro srp srr srs ss- ssd sse ssi ssn sso ssp ssr sss