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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.
I don't think it's possible :/ Because it's marked as spoiler, only those who solved it will be able to see it, so it's not a big deal. But discourse section is more for discussing issues or problems with code, description, etc. Just so you know for future :P
Don't post your solutions in discourse! It's forbidden. Use the solutions tab.