Return the index of the first integer in items that is less than its index, or -1 if no such integer exists in items. >>> small_index([2, 5, 7, 99, 6]) -1
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def small_index(items: list[int]) -> int:
"""
Return the index of the first integer in items that is less than its index,
or -1 if no such integer exists in items.
>>> small_index([2, 5, 7, 99, 6])
-1
>>> small_index([-5, 8, 9, 16])
0
>>> small_index([5, 8, 9, 0, 1, 3])
3
"""
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