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In some embodiments, the gesture is a swipe or a tug gesture. In a swipe gesture, the contact moves on touch screen 112 substantially from rest for some distance, with acceleration, and lifts off from touch screen 112 while accelerating. For example, if the gesture performed with contact 546 is a swipe gesture, contact 546 moves in direction 548 with increasing speed for some distance and then lifts off while the speed is still increasing (or still above a predetermined speed threshold). In a tug gesture, the contact moves on touch screen 112 substantially from rest for some distance, with acceleration, and then decelerates (e.g., to substantially a stop) before liftoff. For example, the gesture performed with contact 546 is a tug gesture, contact 546 moves in direction 548 with increasing speed for some distance, and then stops suddenly.