ss="p">(</span><span class="n">ix0</span><span class="o">+</span><span class="n">ix1</span><span class="p">)</span><span class="o">/</span><span class="mi">2</span>
<span class="w">            </span><span class="k">IF</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ix2</span><span class="o">/=</span><span class="n">ix0</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">THEN</span>
<span class="k">               IF</spa