of the invader.  A positive value moves the invader
right. A negative value moves it left.</p>

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            <div class="content"><div class='highlight'><pre>    <span class="hljs-keyword">this</span>.speedX = <span class="hljs-number">0.3</span>;
  };

  Invader.prototype = {</pre></div></div>
            
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                <a cla