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List of operating systems |
 | | System V (a release of AT&T Unix, 'SVr4' was the 4th minor release) |
| | Oberon operating system/(developed at ETH-Zurich by Niklaus Wirth et al) for the Ceres and Chameleon workstation projects. |
| | Operating systems that have only appeared in fiction. |
| www.sciencedaily.com /encyclopedia/list_of_operating_systems (872 words) |
