index</span> <span class="identifier">with</span> <span class="identifier">polygons</span> <span class="identifier">shared</span> <span class="identifier">pointers</span><span class="special">:</span>
<span class="identifier">POLYGON</span><span class="special">((</span><span class="number">1</span> <span class="number">0</span><span class="special">,</span><span class="number">0.4</span> <span class="number">0.8</span><span class="special">,-</span><span class="number">0.5</span> <span class="number">0.8</