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For example it is not humanely possible to follow the trail of a person in a crowded building, unless the building is very dusty or if the person had mud on his shoes. | For example it is not humanely possible to follow the trail of a person in a crowded building, unless the building is very dusty or if the person had mud on his shoes. | ||
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He will also know if he is being followed. | He will also know if he is being followed. | ||
}} | }} |