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I googled and found this. https://magecomp.com/blog/fix-issues-found-review-snippet-markup-search-console/

This is an interesting scenario to solve. I am asking for details so that efforts aren't proceeding to a misunderstood, unworkable solution. As it currently sits in my brain, I want to use an otherwise unused product attribute (GTIN code? 'condition' recoded to "big" and "small"). When AIOS iterates across the basket contents, a flag can be set to invalidate certain other possible shipping choices.