It's a shame that eval() is banned across all of Cody. I understand how its exploitation got out of hand, but this is the sort of problem where it's best suited (and should be legal).
First non-zero element in each column
find the surface area of a cube
Union of two set decreasing order
Find out output of following expression
Is it column vector?
Find out of matrix transpose Complex conjugate
Generate vector according to sign of vector
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