-er ddd dde ddf ddi ddo ddr dds de- ded dee def dei deo der des dfd dfe dff dfi dfo dfr dfs di- did die dif dii dio dir dis dod doe dof doi doo dor dos drd dre dri dro drr drs dsd dse dsf dsi dso dsr dss ed- edd ede edf edi edo edr eds eed eee eef eeo eer ees ef- efd efe eff efi efo efr efs eid eie eif eii eio eir eis eo- eod eoe eof eoi eoo eor eos erd ere erf eri ero err ers es- esd ese esf esi eso esr ess fdd fde fdf fdi fdo fdr fds fed fee fef fei feo fer fes ffd ffe fff ffi ffo ffr ffs fid fie fif fii fir fis foe fof foi foo for fos frd fre frf fri fro frr frs fsd fse fsf fsi fso fsr fss i-d i-f idd ide idf idi ido idr ids ie- ied iee ief iei ier ies ifd ife iff ifi ifo ifr ifs iid iie iif iii iio iir iis io- iod ioe iof ioi ioo ior ios ir- ird ire irf iri iro irr irs is- isd ise isf isi iso isr iss o-i odd ode odf odi odo odr ods oed oee oef oei oeo oer oes of- ofd ofe off ofi ofo ofr ofs oid oie oif oii oio oir ois oo- ood oof ooi ooo oor oos or- ord ore orf ori oro orr ors os- osd ose osf osi oso osr oss rdd rde rdf rdi rdo rdr rds re- red ree ref rei reo rer res rfd rfe rff rfi rfo rfr rfs rid rie rif rii rio rir ris rod roe rof roi roo ror ros rrd rrf rri rrr rrs rsd rse rsf rsi rso rsr rss sdd sde sdf sdi sdo sdr sds se- sed see sef sei seo ser ses sfd sfe sff sfi sfo sfr sfs sid sie sif sii sio sir sis sod soe sof soi soo sor sos sr- srd sre srf sri sro srr srs ss- ssd sse ssf ssi sso ssr sss