-er ddd dde ddf ddi ddo ddp ddr dds de- ded dee def dei deo dep der des dfd dfe dff dfi dfo dfp dfr dfs di- did die dif dii dio dip dir dis dod doe dof doi doo dop dor dos dpd dpe dpf dpi dpo dpp dpr dps drd dre dri dro drp drr drs dsd dse dsf dsi dso dsp dsr dss ed- edd ede edf edi edo edp edr eds eed eee eef eeo eep eer ees ef- efd efe eff efi efo efp efr efs eid eie eif eii eio eip eir eis eo- eod eoe eof eoi eoo eop eor eos ep- epd epe epf epi epo epp epr eps erd ere erf eri ero erp err ers es- esd ese esf esi eso esp esr ess fdd fde fdf fdi fdo fdp fdr fds fed fee fef fei feo fep fer fes ffd ffe fff ffi ffo ffp ffr ffs fid fie fif fii fip fir fis foe fof foi foo fop for fos fpd fpe fpi fpo fpp fpr fps frd fre frf fri fro frp frr frs fsd fse fsf fsi fso fsp fsr fss i-d i-f idd ide idf idi ido idp idr ids ie- ied iee ief iei iep ier ies ifd ife iff ifi ifo ifp ifr ifs iid iie iif iii iio iip iir iis io- iod ioe iof ioi ioo iop ior ios ipd ipe ipf ipi ipo ipp ipr ips ir- ird ire irf iri iro irp irr irs is- isd ise isf isi iso isp isr iss o-i odd ode odf odi odo odp odr ods oed oee oef oei oeo oep oer oes of- ofd ofe off ofi ofo ofp ofr ofs oid oie oif oii oio oip oir ois oo- ood oof ooi ooo oop oor oos op- opd ope opf opi opo opp opr ops or- ord ore orf ori oro orp orr ors os- osd ose osf osi oso osp osr oss p-p pdd pde pdf pdi pdo pdp pdr pds ped pee pef pei peo pep per pes pfd pfe pff pfi pfo pfp pfr pfs pid pie pif pii pio pip pir pis pod poe pof poi poo pop por pos ppd ppe ppf ppi ppo ppp ppr pps prd pre prf pri pro prp prr prs ps- psd pse psf psi pso psp psr pss rdd rde rdf rdi rdo rdp rdr rds re- red ree ref rei reo rep rer res rfd rfe rff rfi rfo rfp rfr rfs rid rie rif rii rio rip rir ris rod roe rof roi roo rop ror ros rpd rpe rpf rpi rpo rpp rpr rps rrd rrf rri rrp rrr rrs rsd rse rsf rsi rso rsp rsr rss sdd sde sdf sdi sdo sdp sdr sds se- sed see sef sei seo sep ser ses sfd sfe sff sfi sfo sfp sfr sfs sid sie sif sii sio sip sir sis sod soe sof soi soo sop sor sos spd spe spf spi spo spp spr sps sr- srd sre srf sri sro srp srr srs ss- ssd sse ssf ssi sso ssp ssr sss