In the place of "Find the sum of all products whose...", I would say: "Find the number of all products whose..." ;-)
Why  instead of 0?
Since I have kludged a solution together, can I have a hint?
this solution works on my comupter
I see the first test command line is corrupted
:( :( :(
I've fixed that first line in the test suite. Try it again.
First non-zero element in each column
ASCII Birthday Cake
Calculate Amount of Cake Frosting
Expression or variable?
Two functions (to be sure)
Rank of magic square (for beginners)
Find indices of diagonal elements
Negation and new variables
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