title: How to print an ArrayList of ArrayLists so that each inner list is printed on one row?
body: <p>I have an ArrayList of ArrayLists - something like <code>ArrayList&lt;ArrayList&lt;Node&gt;&gt;</code>.
  Since I get this as a return value from a function, after every call a different size is called. I am wondering how to display its elements is such a way that the inner ArrayList constitutes one row and so for every row.  </p>
  
  <p>What would be my required parameter(s) for the for loop? Thanks in advance.</p>