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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 exchange :D
Nope. Not sure why I included them to be honest, as I think the code is more readable without :-)
are brackets necessary?
description of this kata clearly says: "All values will be positive integers or floats." abs is not required.