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50000?????9218! (10 off 50)
50000?????9346! (15 off 75)
50000?????9382! (20 off 100)
50000?????9388! (40 off 200)
50000?????9394! (60 off 400)
50000?????0151! (10% off)

The ? are random digits 0-9
The ! is a calculated check digit
I’m going to show you how to calculate the check digit.

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