Wikipedia - Anatta -- Non-self, a key concept in Buddhism
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Wikipedia - Dharma -- Key concept in Indian philosophy and Eastern religions, with multiple meanings
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Wikipedia - Natural rate of unemployment -- Key concept in the study of economic activity
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Wikipedia - Sign system -- Key concept in semiotics used to refer to any system of signs and relations between signs
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https://www.goodreads.com/book/show/1909637.Key_Concepts_in_Politics
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https://www.goodreads.com/book/show/21408333-key-concepts-in-geomorphology
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https://www.goodreads.com/book/show/24432070-key-concepts-in-politics-and-international-relations
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https://www.goodreads.com/book/show/28106050-learn-memorize-key-concepts-from-the-7-habits-of-highly-effective-peop
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https://www.goodreads.com/book/show/7070640-key-concepts-in-life-and-death
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