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."
Determine whether a vector is monotonically increasing
Transposition as a CIPHER
Sum the numbers on the main diagonal
Poker Series 08: IsPair
Make a random, non-repeating vector.
Get ranking of a combination
Find perfect placement of non-rotating dominoes (easier)
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