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              <p>Main game tick function.  Loops forever, running 60ish times a second.</p>

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