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  <head>
    <title>canvas_query examples</title>
    <link rel="stylesheet" href="example.css">
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  <body>
    <div class="showcasenav">
      <div class="showcaseintro">
        These examples show some of the functionality of CanvasQuery.<br />
        Select an example from the list below to see what is possible using CanvasQuery.
      </div>
      <ul>
        <li id="show_coloring">Coloring of units</li>
        <li id="show_blending">Blending of images</li>
        <