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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.
Very cool, learned something new.
Annoying that I find efficient solutions but still get timeouts using Ruby, can only pass 73 tests. Oh well