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."
Find the two most distant points
Twins in a Window
Angle between two vectors
Project Euler: Problem 1, Multiples of 3 and 5
Flag largest magnitude swings as they occur
Make a simplified barcode
Get ranking of a combination
Is this a valid Tic Tac Toe State?
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