title: Using subtract predicate in swi prolog
body: <p>I need to subtract certain numbers from the given list. I use SWI Prolog. This was what I did.</p>
  
  <pre><code>subtract([1,4],[1,2,3,4,5],'L')
  </code></pre>
  
  <p>But it doesnt seem to working in SWI prolog..pls help me....</p>