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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.
You are totally right. Plus, the timeout is due to an inappropriate choice of structure and not to the kata itself.
How would it be irrelevant? Your code is too slow, that's why it times out. Also please don't post twice for the same thing on a different thread. It's no use to flood the Discourse page because your code doesn't do what you would like.