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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 looks like you're mixing several test cases together. The input for the test you fail is just
a, and the filter token for that test is alsoa. Your solution is returninga, but it expects an empty string.