-er ddd dde ddf ddi ddo ddr dds ddx de- ded dee def dei deo der des dex dfd dfe dff dfi dfo dfr dfs dfx di- did die dif dii dio dir dis dix dod doe dof doi doo dor dos dox drd dre dri dro drr drs drx dsd dse dsf dsi dso dsr dss dsx dxd dxi dxo dxr dxs dxx ed- edd ede edf edi edo edr eds edx eed eee eef eeo eer ees eex ef- efd efe eff efi efo efr efs efx eid eie eif eii eio eir eis eix eo- eod eoe eof eoi eoo eor eos erd ere erf eri ero err ers es- esd ese esf esi eso esr ess esx ex- exd exe exi exo exr exs exx fdd fde fdf fdi fdo fdr fds fdx fed fee fef fei feo fer fes fex ffd ffe fff ffi ffo ffr ffs ffx fid fie fif fii fir fis fix foe fof foi foo for fos fox frd fre frf fri fro frr frs fsd fse fsf fsi fso fsr fss fsx fxe fxi fxr fxs fxx i-d i-f idd ide idf idi ido idr ids idx ie- ied iee ief iei ier ies iex ifd ife iff ifi ifo ifr ifs ifx iid iie iif iii iio iir iis iix io- iod ioe iof ioi ioo ior ios ir- ird ire irf iri iro irr irs irx is- isd ise isf isi iso isr iss ixe ixi o-i odd ode odf odi odo odr ods oed oee oef oei oeo oer oes oex of- ofd ofe off ofi ofo ofr ofs ofx oid oie oif oii oio oir ois oo- ood oof ooi ooo oor oos oox or- ord ore orf ori oro orr ors orx os- osd ose osf osi oso osr oss osx ox- oxf oxi oxo oxx rdd rde rdf rdi rdo rdr rds rdx re- red ree ref rei reo rer res rex rfd rfe rff rfi rfo rfr rfs rid rie rif rii rio rir ris rix rod roe rof roi roo ror ros rox rrd rrf rri rrr rrs rsd rse rsf rsi rso rsr rss rsx rxr rxs sdd sde sdf sdi sdo sdr sds se- sed see sef sei seo ser ses sex sfd sfe sff sfi sfo sfr sfs sfx sid sie sif sii sio sir sis six sod soe sof soi soo sor sos sox sr- srd sre srf sri sro srr srs srx ss- ssd sse ssf ssi sso ssr sss ssx sxi sxs xde xdf xdi xdr xds xed xee xer xes xex xfe xfs xfx xie xii xio xis xix xod xof xoi xoo xor xos xox xrd xrf xrx xsi xss xxi xxo xxx