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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.
Not really an issue.
There are some minor formatting issues with the example code and it could probably be mentioned if object validation is necessary (it isn't given the test cases currently).