Angle between two vectors
Reverse the elements of an array
Perfect Square or not
Pernicious Anniversary Problem
Divisible by 3
Temperature Conversion Utility
Lights Out 5 - 5x5, 10 moves
Rule of mixtures (composites) - either bound
Mersenne Primes vs. All Primes
Lights Out 8 - 5x5, light-only solution? I
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