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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.
Regarding the rounding - it worked when I went low but not when I went high. And sometimes a being greater than or equal to b isn't the same as b being less than a. Hope that helps.