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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 right. Several languages have an incorrect plural in function name, at least: Python, JS, Ruby, TypeScript, Racket, Elixir, Go, CoffeeScript, maybe others. I don't know if this can be fixed easily in all of them without breaking submitted solutions.