Even though this problem is simple, it would be helpful to expand the test suite to prevent gaming the system.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Replace NaNs with the number that appears to its left in the row.
Find out missing number from a vector of 9 elements
Duplicate a character
Remove the Zero
Summation of array
Is It a Palindrome?
Skip by a multiple
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