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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.
true, thx
Your solution is faster but eats a lot of memory. At sandbox.onlinephpfunctions.com your solution with n = 5000000 runs of ouf memory.