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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.
I solved that issue by using Math.ceil() instead of Math.floor, and then subtracting 1. This will give identical results in all cases except when the bounce takes you exactly to the window, in which case it'll subtract that bounce out.