title: Nested loop for alphabets
body: <p>How do I go about making a loop that created an array like the following:</p>
  
  <pre><code>aa
  ab
  ac
  ad
  </code></pre>
  
  <p>I was thinking about making a loop that loops through a-z, then another one nested inside that loops through a-z, would that be the correct approach? If yes, how do I implement it?</p>