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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, oops. came straight from mystery 1 and skipped reading the full description
Calling the mystery function twice in a row causes the second call to return null. Is that expected?