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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.
-7891910.6360572055seems to be the correct result. Have you changed the order of operations anywhere (even addition isn't associative for floating point numbers) or usedFloatinstead ofDouble? If not, post your code here flagged as a spoiler.