-er ddd dde ddf ddi ddo ddr de- ded dee def dei deo der dfd dfe dff dfi dfo dfr di- did die dif dii dio dir dod doe dof doi doo dor drd dre dri dro drr ed- edd ede edf edi edo edr eed eee eef eeo eer ef- efd efe eff efi efo efr eid eie eif eii eio eir eo- eod eoe eof eoi eoo eor erd ere erf eri ero err fdd fde fdf fdi fdo fdr fed fee fef fei feo fer ffd ffe fff ffi ffo ffr fid fie fif fii fir foe fof foi foo for frd fre frf fri fro frr i-d i-f idd ide idf idi ido idr ie- ied iee ief iei ier ifd ife iff ifi ifo ifr iid iie iif iii iio iir io- iod ioe iof ioi ioo ior ir- ird ire irf iri iro irr o-i odd ode odf odi odo odr oed oee oef oei oeo oer of- ofd ofe off ofi ofo ofr oid oie oif oii oio oir oo- ood oof ooi ooo oor or- ord ore orf ori oro orr rdd rde rdf rdi rdo rdr re- red ree ref rei reo rer rfd rfe rff rfi rfo rfr rid rie rif rii rio rir rod roe rof roi roo ror rrd rrf rri rrr