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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.
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This is the least thing you should worry about regarding speed of Python code.
Well, he just left it like that, why not)
Yes, what other thing could they be?
Not in this kata.