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The Real Rule of Four

Important places

Princeton University (19)
Chicago (1,721)
New York (7,400)

Counties

Mercer (121)
Cook (1,792)
New York (8,072)

Regions

Ohio (1,283)
New Jersey (1,469)
Texas (2,882)
Illinois (2,704)
New York (9,763)

Countries

Italy (5,202)
United States (64,950)

Other geographical areas

Edwards Plateau (159)
Central Lowlands (North America) (1,334)
Great Plains (2,255)
North Atlantic Ocean (8,812)