title: Does order matter in context free grammar?
body: <p>let say i have the follow grammar:</p>
  
  <blockquote>
  <pre><code>expr = expr + term | term    
  term = term +  number | number    
  number = (just any integers..)
  </code></pre>
  </blockquote>
  
  <p>My question is, is <strong>expr = expr + term | term</strong> same as <strong>expr = term + expr | term</strong>?</p>
  
  <p>I expanded the grammar, and it seems does matter. am i correct?</p>