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The robot can sense (observe) its surrounding walls, whether there is a wall in ...
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The robot can sense (observe) its surrounding walls, whether there is a wall in the north (N), south (S), east (E), or west (W). At the current position, the robot observed that there were walls in NSW. Thus, the possible current position of the robot might be one of the following positions (1, 2, 3, or 4):
After moving to the east, the robot observed that there were walls in NS. What is the position of the robot?
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