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    "input:" and "output:" there were added by NitOwl007, that seems Python and the error message would be like this: [1, 2, 4] should equal [1, 2, 4, 8, 16]

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    what language produces such message? it's indeed confusing and could use some improvements.

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    No, the input is a single number, the first one of those values is what your function returned instead of the expected one (the second value).