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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.
The description spoils the whole algorithm for the task, essentially trivializing the kata.
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Is there a specific reason you only test square arrays? I feel like it would make more sense if we had some tests which included non-square and even non-rectangular arrays.
Also, in the random tests, it's a bit weird to me to populate the entire array using the same value, and also that you only test the 3x3 case.