title: Can anyone explain what they mean by "process subset" under if(k == n)?
body: <p>Referring to this stack overflow post here:
  <a href="https://stackoverflow.com/questions/56925250/can-someone-explain-how-recursion-works-when-finding-all-subsets/58359382?noredirect=1#comment103071180_58359382">Can someone explain how recursion works when finding all subsets?</a></p>