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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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You are not returning a longest possible common subsequence. Please read the description carefully. Have you read the Wikipedia article? Did you solve the non-performance version first?
This is not a kata issue; it should have been marked "question", not "issue".
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I think this fact was already known at the time it was approved. Anyway, as it often happens with golfing katas, it expects a certain type of solution.
If you have something more general, feel free to submit it here https://www.codewars.com/kata/the-soul-of-wit-reverse-an-array ;-)
Have you found a solution that would work with that input and still being in the code length limit? Maybe the tests are ok for that.