"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. :)
Remove the air bubbles
So many choices
Calculate area of sector
Find the average of a random sequance
Product of Each Column
Horizontal matrix sort
How many days in a month?
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