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Oz is the nickname for the Oswald State Correctional Facility, a maximum-security prison of undisclosed location. Many of the plot arcs are set in Emerald City ("Em City"), an experimental unit of the prison, where the unit manager tries to emphasize rehabilitation and learning responsibility during incarceration. Emerald City is a controlled environment. There are a limited number of members of each racial and social group. The microcosm of Emerald City mirrors the racial and economic tensions in the then present-day United States.
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