title: Construct a CFG for Regular Expression
body: <p>i had problem with my homework, can someone explane me for the question below. thank you</p>
  
  <p>Construct a CFG for RE below :</p>
  
  <ol>
  <li>a* b* (a│c)*</li>
  <li>(a│c)* ba</li>
  </ol>