AT&T "nth Edition" vs. "Release n"

[Andrew Hume]

	Anytime someone says 8th, 9th or 10th edition (or V8, V9 or V10)
they are referring to that edition of the Research Unix system (or more
precisely, its manual). The commercial unix, System V, has various names
that look like 5.3.2, or Release 4.0 (== 5.4.0).
	Under no circumstances, can anyone claim to have a 9th edition
system V and actually mean anything.