### find unique elements

Write, efficient code for extracting unique elements from a sorted list of array. e.g. (1, 1, 3, 3, 3, 5, 5, 5, 9, 9, 9, 9) -> (1, 3, 5, 9).

o(n)

And what if the elements are not in sorted order.

o(n)

And what if the elements are not in sorted order.

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