The figure below shows ownership of forests in the United States. What is the total percentage of forests that would be considered public lands (i.e., owned by the government) ? 
Definitions:
Chronic Pain
Persistent pain that extends beyond the usual course of an acute illness or healing of an injury, often lasting for months or years.
Immune System
The complex network of cells, tissues, and organs that work together to defend the body against infection and disease.
Periaqueductal Grey
A region in the midbrain involved in pain modulation, fear conditioning, and the integration of pain and emotional responses.
Optical Illusions
Visual phenomena where the perception of reality is distorted, causing the observer to see something different from the actual object or scene.
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