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Create a method that output unique values in a 2D array
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Ensure your tests are passing
- A method to remove collision using Hashset
- create a hash set to remove collison among duplicates
- create a list to return the data
- Add all the values to hashset
- Add allt the values to a list
- Return the list
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Space Complexity O(n^2) for a 2d array
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Time Complexity O(n2) for two for loops in the main method