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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.
Yes
Codewars bug. Just click the "Unlock solutions" button since you would've already been rewarded honor and language ranking xp. It shouldn't change anything.