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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.
Same solution as I did, I like this since it is clean and easy to understand. Run this again and print out your results of x,y, since you're offseting with 'a' you're not getting the scores within the range of 0 <=x,y <=4. It still gives the correct output though since we're offsetting both x and y.