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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 doesn't throw any errors because Python doesn't care. You're free to overwrite any built-in functions you want (why would one do this, is different question).
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Could it be sum becomes too big?