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    This was a very interesting kata. I liked it. for Js, pay close attention to the second argument, if and when stuck.

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

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    Could the kata be revised with more detail. From intercation with it, I have close to 4 solutions that passed the first test cases but would give me random passes on submission. I believe this is due to the fact that, 'silently', the code should work under the assumption that a letter in str1 should not be used twice. This would be a very concise addition, moving forward.

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    first attempt at this, hacks are welcome