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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.
I tried your solution that did not fail that test: you pass that test but fail another one, always the same.
When reporting a problem think to give the input.