title: How to count number of distinct entries in 2d list?
body: <p>I have a 2D list and I want to learn how to return the number of distinct entries there are in the table.</p>
  
  <pre><code>numbers = [[32, 12, 52, 63], [32, 64, 67, 52], [64,64,17,34], [17, 76, 98]]
  </code></pre>
  
  <p>since there are 10 numbers that are not the same I want it to return that number, how do I go about that?</p>