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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.
Try the millionth fibonacci kata if you want that :)
I think this should be updated (or a new version of it) to use bigint, not number. Or in the details it should state that the result goes until Number.MAX_VALUE then NaN, and not "an infinite sized, sequential".