Firstly, Gemstone III isn't "persistant". Secondly, in terms of duration it only went live in 1995 - and there are numerous muds which have been around longer than that. You might then argue that the original Gemstone went live in 1987 - to which I would point out that the original MUD appeared in 1978, and MUD2 is still around (at mudII.co.uk 23).
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