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
High school cafeteria
Spot the outlier
Poker Series 08: IsPair
Decode a simplified barcode
Make a random, non-repeating vector.
Convert a vector into a number
Find best placement for ordered dominoes (harder)
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