What does "}{" mean?

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Newsgroups gmane.comp.lang.perl.fun
Message-ID <[email protected]> 

What does the construct "}{" mean?  As in


  $ perl -pe ' } { $_="foo\n"' /dev/null
  foo

I figure it has to do with how the -p switch affects the script that
is passed to the interpreter.  Is this documented anywhere?

kj
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