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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.
In rust 8.0 / 30.0 * 100.0 returns 26.666666666666668 which makes the test fail since merr is set to -12 (and description mentions precision should be -9)
I think this should be marked as 7kyu difficulty