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.
How to find the position of an element in a vector without using the find function
Generate N equally spaced intervals between -L and L
Back to basics - mean of corner elements of a matrix
Create a vector
Reverse a string
Remove the Zero
Is It a Palindrome?
Remove and Sort
Skip by a multiple
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