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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.
You are absolutly right. Seems like I had luck when I tried to submit it the first time. Maybe I will fix it
How come this got through the test? Shouldn't this throw an error whe x does not contain n?