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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.
That's not what Kysovich is talking about: in Ruby, initial solution already includes a code.
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It seems Ruby is the original language, and it could be the intention of the author to provide a hint with this. Though I agree there should not be that, and other languages don't have it.