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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.
Why would it be slower? Not that performance matters when you are doing code golf.
It will shave a few bytes but on the other hand the time of execution will be longer
You can omit the
;and replace&&with&to shave a few bytes