def test_equals(self):
     self.assertEqual(duplicates([1, 2, 4, 4, 3, 3, 1, 5, 3, '5']),
                      [4, 3, 1])
 def test_equals(self):
     self.assertEqual(duplicates(
         [1, 2, 4, 4, 3, 3, 1, 5, 3, '5']), [4, 3, 1])
 def test_equals_2(self):
     self.assertEqual(duplicates([0, 1, 2, 3, 4, 5]), [])
 def test_equals_2(self):
     self.assertEqual(duplicates([0, 1, 2, 3, 4, 5]), [])