My gps-equipped radiowave controllable robot Lori is somewhere on the surface of Earth. I order her to drive 100 miles South and she obeys. Then I order her to drive 100 miles West and she obeys. Then I order her to drive 100 miles North and she obeys. After this I look at my gps receiver and notice that Lori is exactly where she was at the beginning of the story.
Classify all points where she could have started given this knowledge