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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.
It says there you only passed 4 tests, there are 25 tests. Under a certain condition, your function is not returning (the same as returning
None), that's the error about.Not an issue, it means that you didn't return anything.