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an African American
He is studying the history of African Americans.
parasympathetic nervous system
The parasympathetic nervous system helps our body to relax and conserve energy.
UNESCO (the United Nations Educational, Scientific and Cultural Organization)
UNESCO is an international organization that promotes the development of education, science, and culture around the world.
the United Nations Security Council
The United Nations Security Council plays a crucial role in maintaining world peace and security.
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