length!! and not "not isempty"... good point!
Reverse Run-Length Encoder
Given an unsigned integer x, find the largest y by rearranging the bits in x
Project Euler: Problem 1, Multiples of 3 and 5
Circular Primes (based on Project Euler, problem 35)
Magic is simple (for beginners)
Find indices of diagonal elements
BLOCK x3 (Version 1)
Chess ELO rating system
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