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.
Replace NaNs with the number that appears to its left in the row.
Back to basics 5 - Clipboard
Magic is simple (for beginners)
Switch matrix to a column vector
Add two numbers
Remove and Sort
Product of Array
Is It a Palindrome?
Remove the Zero
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