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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.
Really, really cool solution, but definitely not best practices.
If the input is something else than integers, (floats, for example) this will not work.