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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 is the prefered and idiomatic way
Very elegant, I like the use of the Rust idiom
I'm not sure what the intention is here: this will still throw an IndexError if len(a) < 2...