Top bar. Swipe down from it to drag the notifications open and then swipe away any notifications you want to get rid of (because that is somehow easier than tapping once with your right thumb on the big bar at the bottom and then tapping the X next to a notification to clear it as we did under ICS when such things were laid out sensibly). And if there's a way to toggle notifications off under Jelly Bean, I've yet to see it. :/
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