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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.
Get started now by creating a new collection.
I know this kata ranking has been moved around a bunch, but it's worth noting that: https://www.codewars.com/kata/valid-parentheses/train/javascript is 5kyu, and is 1/3 of the problem that this is.
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