title: Comparing list in python
body: <p>Hey im starting to learn python and after a loop function i got a list which looks like this</p>
  
  <pre><code>&gt;&gt;&gt;print test
  
  ['a','b','c','d']
  ['a','c','d','e']
  ['b','d','e','f']
  </code></pre>
  
  <p>I want to compare it and found things like intersection BUT as the two lists are under one name i can't get it done.</p>
  
  <p>I want to compare the lists and count the letters. Expectation:</p>
  
  <pre><code>d, 3
  a, 2
  b, 2
  </code></pre>
  
  <p>etc</p>
  
  <p>Someone can help me with that?</p>
  
  <p>best regards</p>