it took 3 hours!!!
"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. :)
Sum the Digits of a Number
Dimensions of a rectangle
Find the largest number
Sum of Two Numbers
Add a vector to a matrix
Product of Each Column
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