def test_equals_2(self):
     self.assertEqual(delete_nth([1, 1, 3, 3, 7, 2, 2, 2, 2], 3),
                      [1, 1, 3, 3, 7, 2, 2, 2])
 def test_equals(self):
     self.assertEqual(delete_nth([20, 37, 20, 21], 1), [20, 37, 21])