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3
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USER: Software
Procedure:
After reading the voucher, the program will signal whether the ticket is:
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already used
4.2
Voucher: already used or not valid
The customer goes to the cashier with the ticket to be paid and a discount voucher
already used or not valid.
Function
▪
not valid
Result:
No discount will be applied to the ticket.
Fig.42
Fig.43