The output of * operator in this solution is a struct, rather than a mPoly object. Nevertheless, the test suite does not check the type of the output.
L Y Cao, since you're such a wizard with indices, I'd love to see you solve this without converting to the array form. It would be interesting to compare the approaches.
Andrew Newell, thanks for your advice.
Maximum running product for a string of numbers
Equidistant numbers containing certain value in an interval
Back to basics 8 - Matrix Diagonals
Magic is simple (for beginners)
Fangs of a vampire number
Outer product of multiple vectors
Negation the hard way
Find all vampire fangs
Product of two multivariate polynomials
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