title: How to represent a Towers of Hanoi problem using a graph?
body: <p>I am not able to figure out how the graphs shown <a href="https://en.wikipedia.org/wiki/Tower_of_Hanoi" rel="nofollow noreferrer">here</a> are constructed?</p>
  
  <p>For example, what does this graph represent?</p>
  
  <p><a href="https://i.stack.imgur.com/PEt1e.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PEt1e.png" alt="alt text"></a><br>
  <sub>(source: <a href="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Tower_of_Hanoi-2.svg/255px-Tower_of_Hanoi-2.svg.png" rel="nofollow noreferrer">wikimedia.org</a>)</sub>  </p>
  
  <p>"<code>Nodes are distribution of discs</code>", but I will only have one disc of size <code>a</code>. So, what does node <code>aa</code> represent?</p>
  
  <p>I know the answer would be simple, but I cannot figure it out at the moment.</p>