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.
Get the length of a given vector
Angle between Two Vectors
Diophantine Equations (Inspired by Project Euler, problem 66)
Convert from Fahrenheit to Celsius
Sum of big primes without primes
Negation and new variables
Decrypt the cypher using XOR encryption (for beginners)
Find my secret number
Getting the indices from a matrix
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