You need multiple tests to check a variety of situations.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
improve test suite
So many choices
First non-zero element in each column
Compute a dot product of two vectors x and y
Area of rhombus
Divide by 4
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