Puzzling Adventures: What Happens When Sea Levels Rise: Wet Walls on Whit Island

Solution to Problem #2

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2. See the figure.

New construction goes like this:
First year: 1 square kilometer
Second year: 1 square kilometer
Third year: 1 square kilometer
Fourth year: 1 square kilometer
Fifth year: 5 square kilometers (the dashed walls)

So, the total Single-Count score is:
1 + 1 + 1 + 1 + 5 = 9

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