Most nonzero elements in row
How to subtract?
Replace Vector Elements
Create matrix of replicated elements
Find the Oldest Person in a Room
Lights Out 4 - 5x5, 8 moves
Rule of mixtures (composites) - either bound
Divisible by 4
Mersenne Primes vs. All Primes
Lights Out 10 - 5x5, with wrapping, 6 moves
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