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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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Thanks for comment, I see Your point and I think the disagreement lies on how you define the "best practise". With the definition You cited You're obviously right and I'm happy to admit that, I also checked that this is how the label itself is defined.
Therefore I amend my statement: The solution to this Kata IS a "best practise". I just want to emphasize that it is a best practise because we have some safety measures (only numbers, at least one element) provided, which is something that you might not always rely on in real life. Sounds good?
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