class="n">X</span><span class="p">(</span><span class="n">i</span><span class="p">)</span><span class="o">==</span><span class="n">XS</span><span class="p">(</span><span class="n">j</span><span class="p">)</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">THEN</span>
<span class="k">               </span><span class="n">Xr</span><span class="p">(</span><span class="n">i</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> 