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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.
Don't be, I am 35 lines ahead :)
Try again, I changed how the random strings were generated.
Make sure you're not modifying the original input.