What does rolling mean in couponing?

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Tags

1. #second
2. #multiple
3. #catalinas
4. #transactions
5. #rolling
6. #practice
7. #refers
8. #register
9. #separating
10. #extreme
11. #catalina
12. #coupons
13. #purchase
14. #couponing
15. #order
16. #transaction
17. #first