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 :-(
Back to basics 9 - Indexed References
letter yes yes & letter no no
Arrange vector in ascending order
Unique values without using UNIQUE function
sum of non-primes
Product of two multivariate polynomials
Multivariate polynomials - emulate symbolic form
Outer product of multiple vectors
Multivariate polynomials - sort monomials
Find vampire numbers
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