Find relatively common elements in matrix rows
Return the first and last character of a string
Divisible by 14
Divisible by n, prime divisors - 11, 13, 17, & 19
Fractal: area and perimeter of Koch snowflake
Smallest n, for n! to have m trailing zero digits
Equal temperament - musical notes and frequency
Make a rainbow matrix (follow-up to checkerboard matrix)
Under the sea: Snell's law & total internal reflection
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