Parse Array Parse Array
Challenging
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In this task you you already have the solution. The problem is that it has a bug and you must try to find and fix it. "import", "exec" and "eval" don't work for this task.

You are given a string that contains a list with integers or nested lists. The integers could have single plus or.... For an incorrectly formatted string -- raise . Elements of the array are separated by commas.

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