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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.
Yes this answer made me second guess my knowledge of delimiters.
Yes it does
You need to check what is "set" and its method "issubset". Order doesn't matter. And actually, sets are unordered in Python.
Which part is unclear?