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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.
Related: Earlier I couldn't see comments which were flagged as spoilers on a kata I created, while JS/CS was selected because it only registered that I had completed it in Ruby. I had to submit JS/CS solutions to publish; do I have to solve it again?