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Please define parachute and balloon.

Balloon - material that can be filled with air, to swell or puff out. Parachute - any material that fills with air and allows an object attached to it to descend slowly. Both definitions have in common the fact that materials fill with air. If the material on the rotors is not taut, then the device will be considered a parachute or balloon and may be placed in Tiers 3 or 4.