-er ddd dde ddi ddn ddp ddr dds de- ded dee dei den dep der des di- did die dii din dip dir dis dnd dne dni dnn dnp dnr dns dpd dpe dpi dpn dpp dpr dps drd dre dri drn drp drr drs dsd dse dsi dsn dsp dsr dss ed- edd ede edi edn edp edr eds eed eee een eep eer ees eid eie eii ein eip eir eis en- end ene eni enn enp enr ens ep- epd epe epi epn epp epr eps erd ere eri ern erp err ers es- esd ese esi esn esp esr ess i-d idd ide idi idn idp idr ids ie- ied iee iei ien iep ier ies iid iie iii iin iip iir iis in- ind ine ini inn inp inr ins ipd ipe ipi ipn ipp ipr ips ir- ird ire iri irn irp irr irs is- isd ise isi isn isp isr iss n-i ndd nde ndi ndn ndp ndr nds ne- ned nee nei nen nep ner nes nid nie nii nin nip nir nis nne nni nnn nnp nns npd npe npi npn npp npr nps nrd nre nri nrn nrp nrr nrs nsd nse nsi nsn nsp nsr nss p-p pdd pde pdi pdn pdp pdr pds ped pee pei pen pep per pes pid pie pii pin pip pir pis pn- pnd pne pni pnn pnp pnr pns ppd ppe ppi ppn ppp ppr pps prd pre pri prn prp prr prs ps- psd pse psi psn psp psr pss rdd rde rdi rdn rdp rdr rds re- red ree rei ren rep rer res rid rie rii rin rip rir ris rnd rni rnn rnp rnr rns rpd rpe rpi rpn rpp rpr rps rrd rri rrn rrp rrr rrs rsd rse rsi rsn rsp rsr rss sdd sde sdi sdn sdp sdr sds se- sed see sei sen sep ser ses sid sie sii sin sip sir sis snd sne sni snn snp snr sns spd spe spi spn spp spr sps sr- srd sre sri srn srp srr srs ss- ssd sse ssi ssn ssp ssr sss