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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 we got lost in the elegance, including the kata creator who gave this as the canonical solution, but not for his C++ solution. It seems that the edge case of "not cut" isn't important in the python version.