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n. a level 4 maximum security design prison in California, as [distinguished] from a level 4-- 270. The cell block, or building, is divided into three sections, with a central control tower, giving the [correctional officer] a 180 degree view of All sections [in the building], and affording no blind spots in which an inmate might commit an act of violence. All SHU (security housing unit) buildings, and typically all SHU kick out yards, are 180 design.
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