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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.
This comment is hidden because it contains spoiler information about the solution
Because you should return the result, not print it to the console. That Information is also in the CW Docs, make sure you read them. Please mark your post as having spoiler content next time.