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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.
Yep, 1 is definitely not prime. I was slightly surprised by that being ommited from the spec, but it was not included in the test cases for JavaScript.
Seems matrixMultiplication is still used in default examples that are used when clicking "test" button
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I'd suggest renaming the function matrix_mult (matrixMultiplication is not a conventional ruby function name)
Also, it might be better to link the Wikipedia page on matrix multiplication than describe it in the markdown for the kata.
Any chance for supporting Ruby on this?