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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.
One of the unusual things is that you have to click right in the box, maybe your mouse accidentally fell on the label.
Anyway, you need to remove your own tests from your submission.
Also, you need to make sure that you have 3.6.0 selected since you use the f-strings which is 3.6+ only.
After doing that, your solution works fine.
Spoiler flag, please.