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Project Euler: Problem 1, Multiples of 3 and 5
Find the sum of the elements in the "second" diagonal
Make a run-length companion vector
Under the sea: Snell's law & total internal reflection
Number of paths on a 3d grid
The last non-zero digit of a factorial
Number of even divisors of a given number
Make a rainbow matrix (follow-up to checkerboard matrix)
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