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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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You're not using L (as a list) at all, and why are you using the same var in your for loop and your list comprehension?
It's not a kata issue when it's a problem with your code, use
Questionlabel next time.