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

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    That's not a kata issue, rather a question.

    The brackets show the place where your answer and expected answer differ. It seems that there is an extra space at the end in your solution.

    You can always print the input to console: see this article

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    Hi people. I have this kind of problem expected:<...netnes is a ecnetnes[]> but was:<...netnes is a ecnetnes[ ]>. But I put into test on expected this "...netnes is a ecnetnes[ ]" (without braces of course). But I cannot figure out what must be on input to make this error. Any ideas? (Java)