[jQuery] jQuery selector puzzle

[jQuery] jQuery selector puzzle

Anyone up for a puzzle?
I'm attempting to write a jQuery (version 1a) selector to apply a
class to every A element which has a sibling UL within a particular
structure: http://www.ollicle.com/eg/jquery/puzzle1.html.
Had my hopes set on a relative xpath
http://proj.jquery.com/docs/Base/Expression/XPath/ but have been
unable to find a combination that works.
The tricky bit appears to be limiting the depth to the direct children
of the li.
Any suggestions?
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