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Challenge 16 - Grouping Data into CSV Files - Solution

Sales Group
100 b
200 a
300 a

You would generate two files: one named Group_a, and one named Group_b. They would have the following structure:

Sales Group
200 a
300 a

and

Sales Group
100 b

Your solution to this task should be generic — that is, it should work for any number of groups, and the names of the groups should not matter.

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