Well, here is what their denim offer says at the end:
Quote:
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Limit one per customer, one per device. Offer is non-transferable. Offer must be used for a single purchase. Terms and Conditions apply.
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So, if it's one per customer and per device, then, I guess, they mean that you can't use the same KSO with 2 accounts and you can't use 2 KSO's with one account (if 1 account=1 customer for Amazon).
Hope, this helps.