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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.
The random tests and sample tests still pass in the same grid copy.
I still feel like the description for d isn't really clear. Am I correct in guessing that it is the target for percentage of unique values in the returned array?
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