-er -ol ddd dde ddf ddl ddo ddr ddt ddx de- ded dee def del deo der det dex dfd dfe dff dfl dfo dfr dft dfx dl- dld dle dlf dll dlo dlr dlt dlx dod doe dof dol doo dor dot dox drd dre drl dro drr drt drx dtd dte dtf dtl dto dtr dtt dtx dxd dxl dxo dxr dxt dxx ed- edd ede edf edl edo edr edt edx eed eee eef eel eeo eer eet eex ef- efd efe eff efl efo efr eft efx eld ele elf ell elo elr elt elx eo- eod eoe eof eol eoo eor eot erd ere erf erl ero err ert etd ete etf etl eto etr ett etx ex- exd exe exl exo exr ext exx fdd fde fdf fdl fdo fdr fdt fdx fed fee fef fel feo fer fet fex ffd ffe fff ffl ffo ffr fft ffx fld fle flf fll flo flr flt flx foe fof fol foo for fot fox frd fre frf frl fro frr frt ftd fte ftf ftl fto ftr ftt ftx fxe fxr fxt fxx ldd lde ldf ldl ldo ldr ldt led lee lef lel leo ler let lex lfd lfe lff lfl lfo lfr lft lfx lld lle llf lll llo llr llt lod loe lof lol loo lor lot lox lrd lrf lro lrr lrt ltd lte ltf ltl lto ltr ltt ltx lxd lxo lxr lxx odd ode odf odl odo odr odt oed oee oef oel oeo oer oet oex of- ofd ofe off ofl ofo ofr oft ofx old ole olf oll olo olt oo- ood oof ool ooo oor oot oox or- ord ore orf orl oro orr ort orx ot- otd ote otf otl oto otr ott ox- oxf oxo oxt oxx rdd rde rdf rdl rdo rdr rdt rdx re- red ree ref rel reo rer ret rex rfd rfe rff rfl rfo rfr rft rld rle rlf rll rlo rlr rlt rod roe rof rol roo ror rot rox rrd rrf rrl rrr rrt rtd rte rtf rtl rto rtr rtt rtx rxr t-x tdd tde tdf tdl tdo tdr tdt tdx te- ted tee tef tel teo ter tet tex tfd tfe tff tfl tfo tfr tft tfx tld tle tlf tll tlo tlr tlt tlx to- tod toe tof tol too tor tot tox trd tre trf trl tro trr trt trx ttd tte ttf ttl tto ttr ttt ttx txe txf txl txt xde xdf xdr xdt xed xee xel xer xet xex xfe xfl xft xfx xld xlf xlr xlt xod xof xoo xor xot xox xrd xrf xrt xrx xtf xtr xtx xxl xxo xxx