can iterate over a collection by using an <a href="../api/symbols/Iterator.html" target="api">Iterator</a>.
More information can be found in the <a href="../intro/collections.html">GoJS Intro</a>.
</p>
            <p>
              <a href="../samples/index.html#collections">Related samples</a>
            </p>
            <hr>
          
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            <h4>Layered Digraph Layout</h4>
<p>
This predefined layout is used