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+-------------+ +------------------+ | Products | | Supplier_Product | ... | P1 | Screw | | S1 | P2 | | P2 | Screw | +------------------+ +-------------+
+--------------------+ +-------------------------------+ | Purchased_Items | | Package_Deliveries | ... | 2005/12/01 | Screw | | FedEx | 2005/12/02 | | 2005/12/02 | Screw | +-------------------------------+ +--------------------+