title: Remove a value from a dictionary with multiple values
body: <p>I've been trying to remove a specific item from multiple values in a dictionary in python and am not completely sure how to do this. For example, in the dictionary:</p>
  
  <pre><code>d  = {('hello', 'hi', 'how are you'): 2, ('hi', 'hello', 'how are you'): 1}
  </code></pre>
  
  <p>How would I remove 'hi' so that all that remains is:</p>
  
  <pre><code>d  = {('hello', 'how are you'): 2, ('hello', 'how are you'): 1}
  </code></pre>