title: How to recursively Iterate an alphabet?
body: <p>I need to write a function which iterates through alphabet (a-z) like this:<br>
  (here is an example for a-c)</p>
  
  <pre><code>a
  b
  c
  
  aa
  ab
  ac
  
  ba
  bb
  bc
  
  ca
  cb
  cc
  
  aaa
  aab
  aac
  
  ... and so on. (until the word has 5 characters)
  </code></pre>
  
  <p>any idea how to do this? I guess I need some recursive function.</p>