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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.
For one line of code, it seems like a waste to import 2 libraries for the purpose of readability when you could just add a docstring for comprehension.
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why use mul instead of explicitly multiplying out?
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What that 1 do?