My professor told us of a technique he used to recover from stack drops. Draw a pattern with a felt tip pen across the side of the stack (on the edges of the ca

My professor told us of a technique he used to recover from stack drops. Draw a pattern with a felt tip pen across the side of the stack (on the edges of the cards). This way a quick glance can tell you if the stack is out of order and it's also faster to sort manually.