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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.
Unfortunately, no.
There's issues on GitHub already about it though:
https://github.com/codewars/codewars.com/issues/249
https://github.com/codewars/codewars.com/issues/1908
Also, there isn't. For feature requests, you can raise an issue on GitHub: https://github.com/Codewars/codewars.com
Hmm... Interesting to see Florin Pop here btw :)