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              <p><strong>invadersBelow()</strong> returns true if <code>invader</code> is directly
above at least one other invader.</p>

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            <div class="content"><div class='highlight'><pre>    invadersBelow: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(invader)</span> </span>{<