Fallback=s2

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Announced here, you can force a journal using S1 to use S2.

http://www.livejournal.com/users/i_am_s1/436.html
http://www.livejournal.com/users/i_am_s1/436.html?fallback=s2

http://www.livejournal.com/users/i_am_s1/2005/09/
http://www.livejournal.com/users/i_am_s1/2005/09/?fallback=s2