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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.
Because your post is visible in the homepage if you don't do it for people who still hasn't solved the kata and you posted a solution in your post. That's why.
Please use spoiler flag next time.