length!! and not "not isempty"... good point!
Project Euler: Problem 2, Sum of even Fibonacci
Arrange Vector in descending order
N-Dimensional Array Slice
Back to basics 17 - white space
Wrapping the Tower of Pisa
Find the path through the cell
Find my secret number
Numbers spiral diagonals (Part 1)
Numbers spiral diagonals (Part 2)
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