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. :)
Back to basics 19 - character types
Is A the inverse of B?
Return area of square
Pi Digit Probability
Vertical matrix sort
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Product of Each Column
How many unique Pythagorean triples?
Horizontal matrix sort
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