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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.
maybe some people just don't know how to convert it
Firstly, the code you've posted is broken. Secondly, as soon as I fixed it, it passed the tests without any problems. I don't know what you're doing, but the problem is on your side.