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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.
I couldn't really see a way to handle
in_rangein the same way as the others, without cracking openIntegeras well, which I was trying to avoid. However, I've just realised myin_rangemethod is broken.