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One day, you went to shopping. Just like everyone else, you parked your car in the underground parking. When you arrived the department, you could not find your car in the first time. Therefore, the main design concept is to solve this problem. Combining a parking card and a scratch card modifies the bad memory. The concept of the scratcher applies that everybody usually carries coins. Consequently, if you have a coin, you can use the card.
National Kaohsiung Normal University
Kaohsiung County, Taiwan