-er ddd dde ddf ddi ddn ddo ddp ddr dds de- ded dee def dei den deo dep der des dfd dfe dff dfi dfn dfo dfp dfr dfs di- did die dif dii din dio dip dir dis dnd dne dnf dni dnn dno dnp dnr dns dod doe dof doi don doo dop dor dos dpd dpe dpf dpi dpn dpo dpp dpr dps drd dre dri drn dro drp drr drs dsd dse dsf dsi dsn dso dsp dsr dss ed- edd ede edf edi edn edo edp edr eds eed eee eef een eeo eep eer ees ef- efd efe eff efi efo efp efr efs eid eie eif eii ein eio eip eir eis en- end ene enf eni enn eno enp enr ens eo- eod eoe eof eoi eon eoo eop eor eos ep- epd epe epf epi epn epo epp epr eps erd ere erf eri ern ero erp err ers es- esd ese esf esi esn eso esp esr ess fdd fde fdf fdi fdn fdo fdp fdr fds fed fee fef fei fen feo fep fer fes ffd ffe fff ffi ffn ffo ffp ffr ffs fid fie fif fii fin fip fir fis fnd fne fnf fni fnn fnp fnr fns foe fof foi fon foo fop for fos fpd fpe fpi fpn fpo fpp fpr fps frd fre frf fri frn fro frp frr frs fsd fse fsf fsi fsn fso fsp fsr fss i-d i-f idd ide idf idi idn ido idp idr ids ie- ied iee ief iei ien iep ier ies ifd ife iff ifi ifn ifo ifp ifr ifs iid iie iif iii iin iio iip iir iis in- ind ine inf ini inn ino inp inr ins io- iod ioe iof ioi ion ioo iop ior ios ipd ipe ipf ipi ipn ipo ipp ipr ips ir- ird ire irf iri irn iro irp irr irs is- isd ise isf isi isn iso isp isr iss n-i ndd nde ndf ndi ndn ndo ndp ndr nds ne- ned nee nef nei nen neo nep ner nes nfd nfe nff nfi nfn nfo nfp nfr nfs nid nie nif nii nin nio nip nir nis nne nnf nni nnn nno nnp nns no- nod noe nof noi non noo nop nor nos npd npe npf npi npn npo npp npr nps nrd nre nrf nri nrn nro nrp nrr nrs nsd nse nsf nsi nsn nso nsp nsr nss o-i odd ode odf odi odn odo odp odr ods oed oee oef oei oen oeo oep oer oes of- ofd ofe off ofi ofn ofo ofp ofr ofs oid oie oif oii oin oio oip oir ois on- ond one onf oni onn ono onp onr ons oo- ood oof ooi oon ooo oop oor oos op- opd ope opf opi opn opo opp opr ops or- ord ore orf ori orn oro orp orr ors os- osd ose osf osi osn oso osp osr oss p-p pdd pde pdf pdi pdn pdo pdp pdr pds ped pee pef pei pen peo pep per pes pfd pfe pff pfi pfn pfo pfp pfr pfs pid pie pif pii pin pio pip pir pis pn- pnd pne pnf pni pnn pno pnp pnr pns pod poe pof poi pon poo pop por pos ppd ppe ppf ppi ppn ppo ppp ppr pps prd pre prf pri prn pro prp prr prs ps- psd pse psf psi psn pso psp psr pss rdd rde rdf rdi rdn rdo rdp rdr rds re- red ree ref rei ren reo rep rer res rfd rfe rff rfi rfn rfo rfp rfr rfs rid rie rif rii rin rio rip rir ris rnd rni rnn rno rnp rnr rns rod roe rof roi ron roo rop ror ros rpd rpe rpf rpi rpn rpo rpp rpr rps rrd rrf rri rrn rrp rrr rrs rsd rse rsf rsi rsn rso rsp rsr rss sdd sde sdf sdi sdn sdo sdp sdr sds se- sed see sef sei sen seo sep ser ses sfd sfe sff sfi sfn sfo sfp sfr sfs sid sie sif sii sin sio sip sir sis snd sne snf sni snn sno snp snr sns sod soe sof soi son soo sop sor sos spd spe spf spi spn spo spp spr sps sr- srd sre srf sri srn sro srp srr srs ss- ssd sse ssf ssi ssn sso ssp ssr sss