The correct order of terms to match the provided definitions is:
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Formal Region - an area on Earth’s surface defined by relatively unchanging cultural or physical traits, often associated with a formal boundary.
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Functional Region - an area on Earth’s surface defined by one or more linkages and activities occurring in that area.
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Vernacular Region - an area on Earth’s surface with boundaries that are based on an individual’s perception, thoughts, and/or knowledge of people and their cultural traits, physical geography, and/or the built environment.