Simple but fun
I'm not sure this would work if there is a 0 in x...
Back to basics 4 - Search Path
Back to basics 26 - Keywords
Find the area of the four walls
Area of a Square
Back to Basics - Find no. of elements in a matrix?
Where is the number that you want to find?
find the 'M'
true or false
Sum the rows
Make an identity matrix whose diagonal elements are 1:n
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