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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.
I'd like to point out that dividing by 3 is not the correct way to convert RGB to grayscale, and maybe it's best if it accepts a 2d array of singular grey values instead.
Solutions containing trailing whitespaces should be accepted as well. I had to tweak my solution to remove them.