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    That took a bit of time to solve. Good kata, but low reward for the effort. IMO, 5 kyu would be appropriate?

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    That would certainly be more cerebral.

    However, where do you draw the line? Writing you own upperCase, min, max, etc functions? If the language supports it, out of the box, then it's out there to be used.

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    @123xylem if smaller number preceeds a larger one, both digits make up a number and so you need to skip the next itiration, otherwise you would double count the following digit. E.g. 4 = IV. If you didn't skip you'd count 4 + 5 (IV + V).