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... he cafeteria operated. They saw people step up to the counter and point at the dishes they wanted. A staff member behind the counter would scoop generous portions onto a plate, place it on a tray, and move on to the next item until the tray was full.
At the end of the counter, the diners would hand over a stamped and signed paper currency to the cashier. If any change was due, the cashier would return a similar paper slip with the appropriate amount, functioning just like real money.
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