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SELECT a.product as product_a, a.customer, b.product as product_b 
FROM Sales a INNER JOIN Sales b ON a.Customer = b.Customer
WHERE a.product < b.product

SELECT a.product as product_a, b.product as product_b, count(*) as pop
+ularity 
FROM Sales a INNER JOIN Sales b ON a.Customer = b.Customer WHERE a.pro
+duct < b.product
GROUP BY a.product, b.product