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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.
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The description claims
Bases are always of length 4
but a sample test has a base of length 0, i.e. a contradiction. This discrepancy should be fixed.I would advise changing the test(s), not the description.
This is nowhere near a 4-kyu challenge.
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