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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.
Well I would assume that your output is different from the correct result at position [0][1], meaning first row, second column,
but im not 100% sure.
Possibly that means your code mutates the input and then it's used to calculate the expected answer. Not sure it's the case here.