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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.
Great way to bypass the -0 problem
Thanks for the answer ctttttttttt.
This comment is hidden because it contains spoiler information about the solution
Intersting. Why does 0 - i produce 0 when i == 0 but -i produces -0?