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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.
This could be easily marked as 6 kyu or Medium speaking leet code rankings.
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)
Ranks can't be changed :(
I think this should be marked as 7kyu difficulty