I can't find it exactly, but:
Quote:
The Underdark: (AR 2100)
Beholder City in the Underdark: (AR 2101)
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So it's probably worth trying 2102 or 2103.
Unfortunately these two buck the trend:
Quote:
The Illithid Lair in the Underdark: (AR 2400)
Exit from the Underdark: (AR 2402)
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So either 2401 or 2403 would probably turn it up if your first attempts failed.
(they're always numbered logically, a big area has a nice round number for a code, adjoining areas are variations on that code)
Don't forget to note where you are before you jump
