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    Very good, thank you!!!

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    This comment is hidden because it contains spoiler information about the solution

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    Interesting. There are seven Ruby solutions that have been submitted over the past few days.
    Do you also see the array being sent to your function?

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    Just updated the Ruby solution to make 0 neutral. Will probably take a bit to propagate.
    Thanks for pointing out the issue.

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    Thanks, I added the second 'abc' test.
    I didn't add the '' characters test as there's a valid hash for the empty string.