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UNICS
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UNIX Time-sharing System v1
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UNIX Time-Sharing System v2
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1973 UNIX Time-Sharing System v4
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UNIX Time-Sharing System v3
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UNIX Time-sharing System v5
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UNIX Time-sharing System v6
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Mini-unix
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PWB/Unix
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UNIX Time-sharing System v7
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Unix system III
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Unix system IV
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Unix system V
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Unix system V release 2.0
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UNIX Time-sharing System v8
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Unix system V release 3.0
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UNIX Time-sharing System v9
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Unix release 3.2
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Unix system V release 4.0
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UNIX Time-sharing System v10
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Unix system V release 4.2
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UnixWare 1.1
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UnixWare 1.1.1
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UnixWare 2.0
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UnixWare 2.1.2
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UnixWare 2.1
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UnixWare 7 ( system V release 5)