title: Grammar Follow Set Explanation
body: <p>I'm looking at the following simple grammar and its accompanying table:</p>
  
  <pre><code>S-&gt; aSbT | epsilon
  T-&gt; bFaF | epsilon
  F-&gt; epsilon
  
  nonterminal first set   follow set  
  S           a           b                                      
  T           b           b
  F           ∅          a b  
  </code></pre>
  
  <p>Could someone please explain why b, but not a, is in the follow set of T?</p>