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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.
Close the duplicate issue. (See user6011550's issue bellow)
You have to write your own sample tests. Or click attempt directly if you don't want to. You can also copy/paste the ones raphaelroques suggested below.