this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
Make a checkerboard matrix
Getting the absolute index from a matrix
Wrapping the Tower of Pisa
Is this a valid Tic Tac Toe State?
Project Euler: Problem 2, Sum of even Fibonacci
Siblings of a graphics object
2048 tile game
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