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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.
Oh, thank you for your reply! :) In this case, it's of course my mistake. Thank you for clarifying that for me.
Not a kata issue. You did not assign a default value for
n"Some Python test cases are missing a positional argument. Unable to submit kata" - I have the same problem :/