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import collections

import unittest

class Solution:

def singleNumber(self, nums):

return collections.Counter(nums).most_common()[-1][0]

class Test(unittest.TestCase):

def test_singleNumber(self):

solution = Solution()

self.assertEqual(solution.singleNumber([2, 2, 1]), 1)

self.assertEqual(solution.singleNumber([4, 1, 2, 1, 2]), 4)

if __name__ == '__main__':

unittest.main()