this problem is working again (note: there have been a few changes to Cody machinery so many of the old tricks no longer work :)
I managed to pass your testsuite and yet have a solution of non-zero-size.
Thanks for catching that! I modified the testsuite to fix this but will not rescore this solution (I am trying my testsuite to *only* pass solutions that will get a zero score in Cody as well; it is a bit hard to do that without being too heavy handed and/or interfering with the ways solvers might get that zero score)
Back to basics 6 - Column Vector
sum of non-primes
Simple equation: Annual salary
03 - Matrix Variables 6
Knights and Knaves (part 3)
German tank problem
Knights and Knaves (part 2)
singularity 2.0 (really hard)
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