title: Combine a List of lists into one list in Scheme
body: <p>So for example I have this List : <code>L</code>
   <code>((a 1) (b 2) (c 3)) ((d 4) (e 5) (f 6))</code><br>
  how can I turn that into 
  <code>((a 1) (b 2) (c 3) (d 4) (e 5) (f 6))</code></p>
  
  <p>A list containing two lists that I need to make one list containing lists.</p>
  
  <p>I know if I car L I get the front half <code>((a 1) (b 2) (c 3))</code> and if I <code>cdr</code> <code>L</code> I get the back half
  <code>(((d 4) (e 5) (f 6)))</code> but I cant figure out how to turn it into the form 
  <code>((a 1) (b 2) (c 3) (d 4) (e 5) (f 6))</code></p>