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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.
Each 3x3-block should contain 1-9.
Does optional arguments belong in 7 kyu? I wonder.
Can run into issues with floating point precision depending on order of operations. Asserts could be a bit friendlier and avoid floating point equality.