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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.
That's a contradiction in the description, but not all languages have the same tests, some tests even change the people in line and the quantity of those. The names of the function's params also change from one language to another (being r the most used, instead of n).