In short, I'll explain it mechanically: you reached -50 north, turned west. From there, you couldn't go anywhere (you always returned), then you went back east (that same -50 north), tried to go north, and again returned to the same place.
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In short, I'll explain it mechanically: you reached -50 north, turned west. From there, you couldn't go anywhere (you always returned), then you went back east (that same -50 north), tried to go north, and again returned to the same place.