|Which Boxes to Move?|
Which Boxes to Move? is the 84th puzzle from The Curious Village.
In preparation for your big move, you've packed your belongings into 20 boxes and arranged them as shown below. With everything packed, you are now ready to label each box with its contents. In order to do so though, you'll need to move a few boxes around. How many of the boxes can't be labeled without rearranging the stacks?