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JUST before Kristin Chenowith left the hit Broadway musical "Wicked," she was in secret talks to extend her contract for another couple of months. But the feisty blonde decided not to re-up because the strain of her testy relationship with co-star Idina Menzel was too much, sources told PAGE SIX.<br /> <font size="1" face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" color="#9c0031">Note how Kristin's name is misspe…