118. Stuart stood in line in the drugstore. The clerk said, "Next!" She asked Stuart for his Rewards card. He was already digging through his wallet for it. He finally found it. It was with seven other Rewards cards for seven other stores. Each card was about one‐fourth the size of a credit card. Every time he shopped, he had to dig all the cards out of his wallet to find the one he was looking for. Dig, dig, dig. He was tired of digging. There must be a better way. When he got home, he put all the loose cards on his desk. He Scotch‐taped them together into one long strip. He left small gaps between the cards so he could fold the whole strip in half. What a simple solution, he thought. He put the folded strip of cards into his wallet. He couldn't wait to go shopping again. 2.4