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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.
It seems as if the values inside the second and third pair of brackets are indexing into the list defined inside the first pair. The '+' operator converts the characters '0' and '1' into their integer representations.