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A Set is a snapshot of a Series on a specific date.
Each format of a given Set is assigned a unique ISBN.
A Set’s contents do not change over time.
If Each time a given Series is expanded after its initial release, a new Set is createdshould created to encompass the new contents.
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In layman’s terms, if a product’s contents change, it’s no longer the same product and therefore merits a new SKU/ISBN. |