Reindex a vector
Who has power to do everything in this world?
Pernicious Anniversary Problem
Divisible by 4
Spot the First Occurrence of 5
Divisible by n, prime divisors (including powers)
Fill-a-pix - Solution Checker
Rule of mixtures (composites) - lower and upper bounds (volumes)
Lights Out 4 - 5x5, 8 moves
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