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identify7Sets do not have to spawn from each other. They can originate in a pool of photos available for manufacturers or distributors to choose the players to be included with their product. The outsourcing of the card design and manufacture could follow or include this selection process.
When the product is chiefly the card, the ACC designation is typically the w- series. Why not catagorize cards in accordance with the product with which they were issued (hey, I didn't think of this first)?