title: The object ___ is not applicable
body: <p>Hi I'm writing something that grabs every third element after the first element. However I can't test the logic due to ";The object (a b c d e f g) is not applicable." The code is below, atom? checks if it's a list, listful is defined as an empty list.</p>
  
  <pre><code>(DEFINE (threes var)
      (if(atom? var)
          ((newline) (DISPLAY "Bad input")  ))
      (APPEND(listful (CAR var)))
      (if(&gt; 3 (length var))
          (threes (cdddr(listful)))
          (listful))
  )
  </code></pre>
  
  <p>Can anyone give me some tips? Here is how I'm calling the method in the Scheme environment.</p>
  
  <pre>
  >(threes (list1))
  >(threes '(A B C D E F))
  </pre>