title: What is the reverse postorder?
body: <p>This is the explanation in wikipedia: <a href="https://en.wikipedia.org/wiki/Data-flow_analysis#The_order_matters" rel="noreferrer">Data-flow analysis</a></p>
  
  <blockquote>
    <p>This is a typical iteration order for forward data-flow problems. In reverse-postorder iteration, a node is visited before any of its successor nodes has been visited, except when the successor is reached by a back edge. (Note that this is not the same as preorder.)</p>
  </blockquote>
  
  <p>Can someone explain this in greater detail?</p>