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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.
i think one sample test case is wrong
i have an issue in returning none in problem
this is a brilliant question
i cracked code in my 2nd attempt but it i think its more of 7kyu