Sorry for all the false positives. I have added more test cases.
It turns out that the difference in meaning between "not both" and "both not" is critical to this problem. Do'h! Took me a while to figure out where I was going wrong. :P
Exactly what I like in Cody. Interesting and modular problem, with good explanations.
What else ?
Thank you, Jean-Marie! If I have time, I might extend the problem even further.
Oops--does not check all conditions--should not have passed.
I now see that this is not a valid solution..it has false positives but still passes the test suite :-(
Which values occur exactly three times?
Energy of a photon
Whether the input is vector?
Vectorize the digits of an Integer
Sum of series I
Multivariate polynomials - convert monomial form to array
Product of two multivariate polynomials
Multivariate polynomials - overload multiplication
Negation the hard way
Find all vampire fangs
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