-er ddd dde ddf ddi ddn ddr ddt ddx de- ded dee def dei den der det dex dfd dfe dff dfi dfn dfr dft dfx di- did die dif dii din dir dit dix dnd dne dnf dni dnn dnr dnt drd dre dri drn drr drt drx dtd dte dtf dti dtn dtr dtt dtx dxd dxi dxn dxr dxt dxx ed- edd ede edf edi edn edr edt edx eed eee eef een eer eet eex ef- efd efe eff efi efr eft efx eid eie eif eii ein eir eit eix en- end ene enf eni enn enr ent erd ere erf eri ern err ert etd ete etf eti etn etr ett etx ex- exd exe exi exr ext exx fdd fde fdf fdi fdn fdr fdt fdx fed fee fef fei fen fer fet fex ffd ffe fff ffi ffn ffr fft ffx fid fie fif fii fin fir fit fix fnd fne fnf fni fnn fnr fnt fnx frd fre frf fri frn frr frt ftd fte ftf fti ftn ftr ftt ftx fxe fxi fxr fxt fxx i-d i-f idd ide idf idi idn idr idt idx ie- ied iee ief iei ien ier iet iex ifd ife iff ifi ifn ifr ift ifx iid iie iif iii iin iir iit iix in- ind ine inf ini inn inr int inx ir- ird ire irf iri irn irr irt irx itd ite itf iti itn itt itx ixe ixi ixn n-i ndd nde ndf ndi ndn ndr ndt ne- ned nee nef nei nen ner net nex nfd nfe nff nfi nfn nfr nft nid nie nif nii nin nir nit nix nne nnf nni nnn nnt nrd nre nrf nri nrn nrr nrt nrx ntd nte ntf nti ntn ntr ntt ntx nxd nxt rdd rde rdf rdi rdn rdr rdt rdx re- red ree ref rei ren rer ret rex rfd rfe rff rfi rfn rfr rft rid rie rif rii rin rir rit rix rnd rni rnn rnr rnt rrd rrf rri rrn rrr rrt rtd rte rtf rti rtn rtr rtt rtx rxr t-x tdd tde tdf tdi tdn tdr tdt tdx te- ted tee tef tei ten ter tet tex tfd tfe tff tfi tfn tfr tft tfx tid tie tif tii tin tir tit tix tnd tne tnf tni tnn tnr tnt tnx trd tre trf tri trn trr trt trx ttd tte ttf tti ttn ttr ttt ttx txe txf txi txn txt xde xdf xdi xdr xdt xed xee xen xer xet xex xfe xfn xft xfx xie xii xin xit xix xrd xrf xrt xrx xtf xti xtr xtx xxi xxx