title: Extract values from defaultdict if there are more than one
body: <p>I got the defaultdict called 'anagrams', that looks like this:</p>
  <pre><code>defaultdict(set,
              {'a': {'a'},
               'act': {'act', 'cat', 'tac'},
               'hitw': {'with'},
               'acn': {'can'},
               'eikl': {'like'},
               'ehty': {'they'},
               'eilnst': {'listen', 'silent'},
               'or': {'or'},
               'be': {'be'}})
  </code></pre>
  <p>Now, I would like to list only the values if there is more than one of them assigned to a single key. I've been searching the web forever for a (list) comprehension that could do the trick, but  I'm out of luck.</p>
  <p>The result should be like:</p>
  <pre><code>[{'act', 'cat', 'tac'}, {'listen', 'silent'}]
  </code></pre>
  <p>Could someone give a hint?</p>