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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.
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I don't know what you're talking about, if you insert an age less than 21 your code won't pass the tests. Unless you're saying that doesn't add anything useful to the exercise.