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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.
Python submission Attempt test cases are all failing; the input and output are switched places.
I copypasted them to my own tests: they pass, the test data itself is ok.
Meanwhile the given Sample tests are working correctly.