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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.
This question is complete bs. Unless you're a math major you'd never have a prayer of solving it without just directly looking it up online. I don't think it should exist.
I think this answer is far more idiomatic than the one voted higher.