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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.
In ruby I raise an error when the activity rank is invalid. The tests want me to do something else, but I do not know what. There is no initial test, so I have no idea what is expected.