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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.
Rounding down would take it from 3.141 to 3.14. That's what rounding down means. This Kumite is just silly.
I'm not sure, but I think it is because it is rounding it down as the next digit is 1.