;Task:
Write a function to flatten the nesting in an arbitrary [[wp:List (computing)|list]] of values.

Your program should work on the equivalent of this list:
   [[1], 2, [[3, 4], 5], [[[]]], [[[6]]], 7, 8, []]
Where the correct result would be the list:
    [1, 2, 3, 4, 5, 6, 7, 8]

;Related task:
*   [[Tree traversal]]
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