Really, you should have a link between what directions you're looking, looking up and backwards aren't technically a pair, should really be look up/down or forward/back.
Find all elements less than 0 or greater than 10 and replace them with NaN
Sort a list of complex numbers based on far they are from the origin.
First non-zero element in each column
Equal to their cube
Product of Array
Is It a Palindrome?
Skip by a multiple
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