Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 2, Sum of even Fibonacci
Getting logical indexes
2倍してみよう - ここからスタート！
Compare two input matrices
Project Euler: Problem 1, Multiples of 3 and 5
Project Euler: Problem 4, Palindromic numbers
Steal, Share, or Catch
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