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."
Encode Roman Numerals
Create One Large Eye of size N x N Quickly?
How long is the longest prime diagonal?
Is this a valid Tic Tac Toe State?
Project Euler: Problem 3, Largest prime factor
Poker Series 03: isFullHouse
Getting the indices from a vector
Poker Series 01: isStraightFlush
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