Because when you get to the fourth pile you’ll have 1 card from each of the other piles which you move to the bottom (just like before) and then the next 4 cards are aces which you then move to each pile 1 at a time leaving the last ace on the top of the 4th pile
Because when you get to the fourth pile you’ll have 1 card from each of the other piles which you move to the bottom (just like before) and then the next 4 cards are aces which you then move to each pile 1 at a time leaving the last ace on the top of the 4th pile