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UnionSets

Write a method named UnionSets that accepts as a parameter a HashSet of SortedSets of integers, and returns a SortedSet of integers representing the union of all of the sets of ints. (A union is the combination of everything in each set.) For example, calling your method on the following set of sets: 

{{1, 3}, {2, 3, 4, 5}, {3, 5, 6, 7}, {42}}

Should cause the following set of integers to be returned: 

{1, 2, 3, 4, 5, 6, 7, 42}
Method: Write a C# method as described, not a complete program or class.

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