title: How to count how many times of a WORD occurs in a List?
body: <p>How to count how many times of a WORD occurs in a List?</p>
  
  <p>For example:
  <code>counthowmany(hello,[hello,how,are,you,hello,hello],N)</code>.</p>
  
  <p><code>N</code> gives the total number of word <code>hello</code> occurs.</p>
  
  <p>Thanks</p>