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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.
There are a ton of problems from this same author, and they are all terrible! Asking for clarification of the terrible descriptions yield a rude reply from the creator. The problems are also underrated for their difficulty, so they aren't even worth doing!