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​Dani, a customer in one of the local supermarkets, noticed that when the cashier passed a wand over some straight lines printed on the side of an item, the description and price of the item appeared on the screen. Explain this observation.

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​Dani, a customer in one of the local supermarkets, noticed that when the cashier passed a wand over some straight lines printed on the side of an item, the description and price of the item appeared on the screen. Explain this observation.: ​Dani, a customer in one of the local supermarkets, noticed that when the cashier passed a wand over some straight lines printed on the side of an item, the description and price of the item appeared on the screen. Explain this observation.

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