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22.47.GroupBy
22.47.1.Use Group By
22.47.2.GroupBy partitions a list of numbers by their remainder when divided by 5.
22.47.3.uses group by to partition a list of products by category.
22.47.4.uses group by to partition a list of each customer's orders, first by year, and then by month.
22.47.5.uses GroupBy to partition trimmed elements of an array using a custom comparer