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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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With your solution, you will parse b and c, a times (On² solution, that is)... maybe you could try to parse each array only once.
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Your loop goes too high. You can make much fewer iterations.
Your solution being too slow is not a kata issue.