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Unix System III
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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 2
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BSD Unix 4.3
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Unix System V Release 3
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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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NetBSD 1.0
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OpenBSD 1.0
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OpenBSD 2.0
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FreeBSD 3.0
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FreeBSD 4.0
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OpenBSD 3.0
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NetBSD 2.0
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NetBSD 3.0
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OpenBSD 4.0
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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
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NetBSD 9.2
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NetBSD 10.0