The elevator in an office building is controlled by a program that uses negative numbers to
indicate moving down and positive numbers to indicate moving up, so the command
+7 causes the elevator to travel 7 floors up.
The elevator is at the 12th floor now. Which series of commands will bring the elevator back
to the 12th floor?
-6, - 6
+3, + 3
-5, - 5, + 5, + 5
+4, + 4,-4.
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