title: SCHEME: Remove sub-lists
body: <p>I haven't had any luck creating function that removes sublists.</p>
  
  <p>I have this list:</p>
  
  <pre><code>'((("a" "c") ("a" "l")) (("b" "c") ("b" "l")) (("c" "hmm")))
  </code></pre>
  
  <p>This should be result:</p>
  
  <pre><code>'(("a" "c") ("a" "l") ("b" "c") ("b" "l") ("c" "hmm"))
  </code></pre>
  
  <p>Any help would be appreciated.</p>