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.
Sort numbers by outside digits
Matrix indexing with two vectors of indices
Make a 1 hot vector
Project Euler: Problem 4, Palindromic numbers
Steal, Share, or Catch: Tournament of Champions
Project Euler: Problem 2, Sum of even Fibonacci
Poker Series 11: selectBestHand
Project Euler: Problem 7, Nth prime
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