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Maximum security prisons and supermax prisons are grades of high security level used by prison systems in various countries, which pose a higher level of security to prevent prisoners from escaping and/or doing harm to other inmates or security guards.
- For the United States, see Incarceration in the United States § Security levels
- For Canada, see Correctional Service of Canada § Security classification of offenders
- For other prison systems, see Prison § Security levels
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