title: Converting ambiguous grammar to unambiguous
body: <p>I did not understand how a unambiguous grammar is derived from a ambiguous grammar? Consider the example on site: <a href="http://www.d.umn.edu/~hudson/5641/l22m.pdf" rel="noreferrer">Example</a>. How was the grammar derived is confusing to me.  </p>
  
  <p>Can anyone please guide me ?  </p>