Why doesn't this SCORE file work?

[Matthew Vernon]

Hi,

This is my SCORE file for uk.misc. I want to score down cross-posts to 2
or more groups, excepting that an article posted to uk.misc and
uk.rec.sheds (and no other groups) shouldn't be scored down. This
fragment doesn't seem to score down posts to uk.misc and one other
group...

Thanks,

Matthew

((&
  ("xref" "[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+" r)
  !(&
    ("xref" "uk.rec.sheds" s)
    ("xref" "uk.misc" s)
    )
  -1000)
 ("xref"
  ("[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+"
   -1000 nil r))
)


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The Dangers of modern veterinary life