"cat" is a really nice touch for concatenation of those arrays! your solutions never fail my expectation.
by the way, i saw that "sub-func" comment...:)
Calling the two sub-functions the right way will not hurt your score. Great work though. :)
Most nonzero elements in row
Replace May with April
04 - Scalar Equations 3
Sum of Two Numbers
Remove the first, third and fifth rows of a matrix
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