title: How to find collocations in text, python
body: <p>How do you find collocations in text?
  A collocation is a sequence of words that occurs together unusually often.
  python has built-in func bigrams that returns word pairs. </p>
  
  <pre><code>&gt;&gt;&gt; bigrams(['more', 'is', 'said', 'than', 'done'])
  [('more', 'is'), ('is', 'said'), ('said', 'than'), ('than', 'done')]
  &gt;&gt;&gt;
  </code></pre>
  
  <p>What's left is to find bigrams that occur more often based on the frequency of individual words. Any ideas how to put it in the code?</p>