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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 worked fine when I ran the code. Are you sure you're not mistaken? Does the test give a list with
[None]and is it a requirement?This comment is hidden because it contains spoiler information about the solution
Does not work when None is present, f.e. the list [None] as input won't work.