Input v is a vector. Return all the elements of v which are not a local minimum or maximum.
Example:
v = [1 2 3 4 5] Output = [1 2 3 4 5]
v = [1 2 3 2 1] Output = [1 2 2 1]
v = [1 2 1 0 2 1] Output = [1 1 1]
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