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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.
Really you should return the x,y coordinate instead of y,x. Threw me for a bit.
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I agree, this should not be voted as best practice
You're doing the same calculation (n*m) twice no need, should just check if n or m === 0