title: How to check if a list is a sublist of another list with order?
body: <p>If I have a list <code>l1=["A","B","C"]</code>, and I have another list <code>l2=["X","Y","Z","A","B","C","1","2","3"]</code>, how can I efficiently check if <code>l1</code> appears in <code>l2</code>, with order as well.</p>
  
  <p>In this case it does appear in the list, but instead if <code>l1</code> was <code>["A","C","B"]</code>, then it would not. Or if it was <code>l2=["X","Y","Z","A","D","B", "C","1","2","3"]</code> this should also not be found as it has to be sequential too.</p>
  
  <p>Thanks</p>