One in not prime!!!
And therefore should not become de-primed.
So many choices
2 b | ~ 2 b
How to subtract?
Dimensions of a rectangle
Matrix multiplication across rows
Lights Out 12 - 5x5, three stages, <7 moves
Divisible by n, prime divisors (including powers)
Scrabble Scores - 2
Lights Out 4 - 5x5, 8 moves
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