Not sure why the problem title says "3x3 matrix", then uses non-3x3 matrices in the example and test suite. Considering rewording for clarity.
Works only because of limited test suite.
Number of Circles in a Number
Find the largest value in the 3D matrix
Try 1.5.4: Celsius to Fahrenheit
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Are you in XY plane?
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