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You can have the following discounts on a single order:
- 1 order-level discount
- 1 free-shipping discount
- 1 tax-exemption discount
- 1 product-level discount *per product*
If a customer ordered a 4x6, 5x7, and 8x10 for home delivery, theoretically they could have 6 separate discount active (3 higher-level discounts & 3 product discounts).
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