title: All Unique Alphabetical Combinations
body: <p>It's been a while since I've used Python and needed to do something like this. But what I'd like to do is loop through every unique four-character alphabetical sequence. For example:</p>
  
  <p><code>aaaa</code>
  <code>aaab</code>
  ...
  <code>aaaz</code>
  ...
  <code>abcd</code>
  ...
  <code>zzzz</code></p>
  
  <pre><code>import string
  az = string.ascii_lowercase
  for c1 in az:
    for c2 in az:
      for c3 in az:
        for c4 in az:
          print(c1 + c2 + c3 + c4)
  </code></pre>
  
  <p>Is there a more efficient and or prettier way to do this?</p>