title: How to find duplicate values in dictionaries
body: <p>How can we find and remove duplicate values along with their keys from a dictionary.</p>
  
  <p>Example:</p>
  
  <pre><code>f = {1:4, 1:3, 4:4, 9:4, 5:7}
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>f = f = {1:3, 5:7}
  </code></pre>
  
  <p>As you can see all the keys with they duplicate value 4 have been removed...</p>
  
  <p>Also is there a way to track how many items have been removed... in the above case 3 items have been removed.</p>