title: How to get the union of two lists using list comprehension?
body: <p>Consider the following lists:</p>
  
  <pre><code>a = ['Orange and Banana', 'Orange Banana']
  b = ['Grapes', 'Orange Banana']
  </code></pre>
  
  <p>How to get the following result:</p>
  
  <pre><code>c = ['Orange and Banana', 'Orange Banana', 'Grapes']
  </code></pre>