this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
Replace NaNs with the number that appears to its left in the row.
Solve the Sudoku Row
Test if a Number is a Palindrome without using any String Operations
Change a specific color in an image
Steal, Share, or Catch
Siblings of a graphics object
Getting the indices from a vector
Get ranking of a combination
Poker Series 08: IsPair
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