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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.
Figured out how to delete the JS version.
It's in R, not JS. Are you wanting to translate this?
I've been googling to figure out how to do a random test. Do you have a reference?