title: Compare multiple lists with the output being the number and identity of each missmatch between every pair of lists
body: <p>I am trying to compare multiple lists:</p>
  
  <pre><code>list1 = ['A', 'B', 'C', ...]
  list2 = ['A', 'B', 'X', ...]
  list3 = ['A', 'X', 'C', ...]
  </code></pre>
  
  <p>The output should give me for each pair of lists the identity and nature of each mismatch. E.g.:</p>
  
  <pre><code>Comp_list1_list2 = C,X and pos3
  Comp_list1_list3 = B,X and pos2
  Comp_list2_list3 = B,X; X,C and pos2; pos3
  </code></pre>
  
  <p>I realize this might be a difficult problem and that it has to be broken down into smaller bits. Any hints to get me on the right track will be very much appreciated!</p>