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Man lifeguard holding binoculars to eyes, hands visible, standing in front of a large public building with crowds; calm vigilance.
Man lifeguard in red shirt holds binoculars with hands and whistle on a lanyard, standing by a stone building path; duty vigilance.
Man lifeguard holding binoculars and rubbing neck in airport terminal while wearing red shirt and whistle; vigilance fatigue.
Woman in pink shirt points two fingers to eye on street near park benches and trees in daylight; vigilance.

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