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This is an experience of John who uses the MetroCard to go to work.
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John goes to the subway station in the morning.
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The train is coming! He pulls out his MetroCard from his bag in front of entrance turnstiles.
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He swipes his MetroCard several times, but it doesn't work.
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He realizes that his MetroCard has expired. He goes to the MetroCard vending machine to refill it. It takes a long time.
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While refilling his card, the train left. He has to wait for the next one.