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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.
No Random Tests.
This error was from trying to use a lambda which was literally one line. Meanwhile, what the code expects is a standard
def
function with two lines. It won't work itself if it's set into one line. So, the code is really expecting a two-liner.