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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'm surpised this isn't the top result, it's the fastest solution I've found:
1.58 µs ± 13.9 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
vs the top solution (in best practices):
1.83 µs ± 23.9 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)