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No dispute here, I was just pointing out that OS X not only stems from Unix (as does, say, FreeBSD), but the "is-a" property also stems from the Open Group actually putting a stamp on it.

This isn't to say OS X is "more of a Unix" than FreeBSD. It means simply what is says, without any other implication: the group that is allowed to say "yeah, this is unix" said that about OS X.

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