title: How to determine the FIRST set of E in this grammar?
body: <p>I wonder how to determine the <code>FIRST</code> set of E with grammar:</p>
  
  <pre><code>E -&gt; XYE | e
  X -&gt; x
  Y -&gt; y
  </code></pre>
  
  <p>Can anyone give me some direction?</p>