When a customer comes to the counter of a dry cleaning shop, he / she shall settle the account at the counter first, and write the contents clearly on the list (in triplicate) and mark it with the code. After receiving the money, he / she will give the other party a list. The other list and the dirty clothes will be put in the dry cleaning room. The third list can be kept by itself for checking; When the customer comes to pick up the clothes, look for the code on the list, and then look for the clothes marked with the code in the room where the clean clothes are stored. It looks like a simple job, but it's not<br>
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