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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.
[5,4] and [6,3] are in contact diagonally.
I found the instructions unclear. It seems an unusual sort of calculation, so being super explicit about where the percentage number is coming from, and which sorts of values are supposed to be ignored and for which purposes (i.e. ignoring negative values for getting the percentage number but not ignoring them for calculating the sum) would be helpful.