-er ddd dde ddf ddi ddn ddr ddx de- ded dee def dei den der dex dfd dfe dff dfi dfn dfr dfx di- did die dif dii din dir dix dnd dne dnf dni dnn dnr drd dre dri drn drr drx dxd dxi dxn dxr dxx ed- edd ede edf edi edn edr edx eed eee eef een eer eex ef- efd efe eff efi efr efx eid eie eif eii ein eir eix en- end ene enf eni enn enr erd ere erf eri ern err ex- exd exe exi exr exx fdd fde fdf fdi fdn fdr fdx fed fee fef fei fen fer fex ffd ffe fff ffi ffn ffr ffx fid fie fif fii fin fir fix fnd fne fnf fni fnn fnr fnx frd fre frf fri frn frr fxe fxi fxr fxx i-d i-f idd ide idf idi idn idr idx ie- ied iee ief iei ien ier iex ifd ife iff ifi ifn ifr ifx iid iie iif iii iin iir iix in- ind ine inf ini inn inr inx ir- ird ire irf iri irn irr irx ixe ixi ixn n-i ndd nde ndf ndi ndn ndr ne- ned nee nef nei nen ner nex nfd nfe nff nfi nfn nfr nid nie nif nii nin nir nix nne nnf nni nnn nrd nre nrf nri nrn nrr nrx nxd rdd rde rdf rdi rdn rdr rdx re- red ree ref rei ren rer rex rfd rfe rff rfi rfn rfr rid rie rif rii rin rir rix rnd rni rnn rnr rrd rrf rri rrn rrr rxr xde xdf xdi xdr xed xee xen xer xex xfe xfn xfx xie xii xin xix xrd xrf xrx xxi xxx