check([1, 2, 3]) ➞ "increasing"

check([3, 2, 1]) ➞ "decreasing"

check([1, 2, 1]) ➞ "neither"

self.assertEqual(check([1, 2, 3]), "increasing")
self.assertEqual(check([3, 2, 1]), "decreasing")
self.assertEqual(check([1, 2, 1]), "neither")
self.assertEqual(check([1, 1, 2]), "neither")
self.assertEqual(check([1, 3, 5, 7, 9, 10]), "increasing")
self.assertEqual(check([5, 6, 5, 7, 9, 10]), "neither")
self.assertEqual(check([5, 7]), "increasing")
self.assertEqual(check([9, 7, 1]), "decreasing")

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