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    If you understand how to do it, then you know why there are many tags.

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    Yeah, it's rather simple task, but try change your attitude: for absolute beginners it may be good point to start analysis of syntax and make common with language concepts, even with using = as assigning variable.

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    It's good idea, so I added link to description. In fact it's so obvious (when you know) that I've had problem how describe it, and write tests, without spoiling solution. Thanks!

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

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    This kata, as all katas, doesn't pretend to be "real world". Maybe the description doesn't please your highly scientific mind, I'm sorry for that, 809 people passed the kata and it's now impossible to change it when more than 500 people passed it.