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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.
Updated python random tests with human-readable strings
The inputs are lists, but the random name generation is not limited to letters so there're a lot of brackets, carets, slashes etc. inside those strings.
The tests should be working alright, and I think the problem is in your code. Unfortunately, the random test generation is totally insane, and you will have to post your solution marked as a spoiler here if you want somebody to help you.
I also marked your comment as a spoiler so that this huge error message is not displayed on the dashboard.