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

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    232 existing solutions make it unlikely there suddenly is a bug.

    It is possible you're returning a wrong datatype, triggering weird messages. That would not be a bug in the tests; it could be considered a bug in your ( incomplete ) solution. Tests do not always handle that gracefully.

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    Hi! Try checking your solution againsta a dataset with multiple visits starting, ending or one starting and another ending at the exact same timestamp.