title: How to find the history of an index in a list?
body: <p>So lets say I have this code: <code>list1 = [1,2,3]</code>.
  So lets say we insert 4 in index 0, <code>list1 = [4,1,2,3]</code>.
  Is there a way to go backwords and find what the "history" of what was in index 0? This a simplified version of my question, but just imagine many different things happened to change <code>list1</code>. </p>