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The method below takes in two sets of integer values called setA and setB. Create a new set of integers, then add any value that is in...
The method below takes in two sets of integer values called setA and setB.
Create a new set of integers, then add
any value that is in both setA and setB.  You can create either
a HashSet or TreeSet.
For example if setA is {2, 4, 6, 8} and setB is {4, 8, 12, 16},
this method should return {4, 8}.
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