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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.
thanks for your aclaration
even i'm getting same output and i think test cases are wrong
it doesn't mention that rank should be updated according to order.