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I "clean" the route (remove the ice screws that the lead climber
puts in to protect against a fall all the way to the ground).
These ice screws get used again and again... being placed by the lead climber
and removed by the last climber. They are either returned to the lead climber
at each belay, or climbers switch leads so the climber "cleaning" one pitch
becomes the one "protecting" the next pitch. And so on it goes.
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