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Unix System II
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Unix System V Release 1
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BSD Unix 4.2
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Unix System V Release 4
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FreeBSD 1.0
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NetBSD 0.8
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FreeBSD 2.0
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BSD Unix 4.4
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Net BSD 2.0
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NetBSD 3.0
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NetBSD 4.0
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NetBSD 5.0
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NetBSD 6.0
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NetBSD 7.0
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NetBSD 8.0
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NetBSD 9.0