Customers Who Bought Products A and B but Not C: coding question

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Given purchase/transaction records, find customers who have bought both product A and product B at least once but never purchased product C; this is a set-membership/filtering task typically solved by grouping customers' purchases and selecting those whose product sets include A and B while excluding C.

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Leetcode 1398. Customers Who Bought Products A and B but Not C
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Customers Who Bought Products A and B but Not C

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Customers Who Bought Products A and B but Not C

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