-er ddd dde ddf ddi ddo ddr ddt ddx de- ded dee def dei deo der det dex dfd dfe dff dfi dfo dfr dft dfx di- did die dif dii dio dir dit dix dod doe dof doi doo dor dot dox drd dre dri dro drr drt drx dtd dte dtf dti dto dtr dtt dtx dxd dxi dxo dxr dxt dxx ed- edd ede edf edi edo edr edt edx eed eee eef eeo eer eet eex ef- efd efe eff efi efo efr eft efx eid eie eif eii eio eir eit eix eo- eod eoe eof eoi eoo eor eot erd ere erf eri ero err ert etd ete etf eti eto etr ett etx ex- exd exe exi exo exr ext exx fdd fde fdf fdi fdo fdr fdt fdx fed fee fef fei feo fer fet fex ffd ffe fff ffi ffo ffr fft ffx fid fie fif fii fir fit fix foe fof foi foo for fot fox frd fre frf fri fro frr frt ftd fte ftf fti fto ftr ftt ftx fxe fxi fxr fxt fxx i-d i-f idd ide idf idi ido idr idt idx ie- ied iee ief iei ier iet iex ifd ife iff ifi ifo ifr ift ifx iid iie iif iii iio iir iit iix io- iod ioe iof ioi ioo ior iot ir- ird ire irf iri iro irr irt irx itd ite itf iti ito itt itx ixe ixi o-i odd ode odf odi odo odr odt oed oee oef oei oeo oer oet oex of- ofd ofe off ofi ofo ofr oft ofx oid oie oif oii oio oir oit oo- ood oof ooi ooo oor oot oox or- ord ore orf ori oro orr ort orx ot- otd ote otf oti oto otr ott ox- oxf oxi oxo oxt oxx rdd rde rdf rdi rdo rdr rdt rdx re- red ree ref rei reo rer ret rex rfd rfe rff rfi rfo rfr rft rid rie rif rii rio rir rit rix rod roe rof roi roo ror rot rox rrd rrf rri rrr rrt rtd rte rtf rti rto rtr rtt rtx rxr t-x tdd tde tdf tdi tdo tdr tdt tdx te- ted tee tef tei teo ter tet tex tfd tfe tff tfi tfo tfr tft tfx tid tie tif tii tio tir tit tix to- tod toe tof toi too tor tot tox trd tre trf tri tro trr trt trx ttd tte ttf tti tto ttr ttt ttx txe txf txi txt xde xdf xdi xdr xdt xed xee xer xet xex xfe xft xfx xie xii xio xit xix xod xof xoi xoo xor xot xox xrd xrf xrt xrx xtf xti xtr xtx xxi xxo xxx