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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.
The return in this js test is constant, adding 'rotten' to each subarray even without running any solution. This former makes it impossible to get the expected result.