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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.
There are 1640 tests in javascript and ~450 in python.
Just make sure your solution can get 2**49th item; if it does then it will definitely pass random tests too :)