I got tired of solving these problems. So, I just wrote a solution that works for everything.
Back and Forth Rows
So many choices
Find a Pythagorean triple
Divisible by 15
Scrabble Scores - 4
Stress-Strain Properties - 4
Mechanical Advantage of a Gear Train
Lights Out 11 - 5x5, with wrapping, x moves
Divisible by 10
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