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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.
Ah yes. I do remember life without children.
This code is the fastest I've tested at an average time of ~0.01577 seconds for 10000 iterations repeated 100 times. It is not the most readable, but definitely the most performant. Nice work!