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."
Increment a number, given its digits
Right and wrong
Fahrenheit to Celsius converter
subtract central cross
Poker Series 02: isQuads
Is this a valid Tic Tac Toe State?
Decode a simplified barcode
Flag largest magnitude swings as they occur
Implement simple rotation cypher
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