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spec: Trouble is , Stella ' s post-orgasmic riff is about the only thing in Previn ' s 1998 opera ( with a libretto fashioned by Philip Littell ) that radiates the same seductive dysfunction and absurdly drawn characterization as Tennessee Williams ' iconic play . The second two PCS runs in this hole failed when the ball valve failed to close , and therefore , no pressure was recovered . After that round , the first two students run to the back of their respective team 's line and the next two players step forward and prepare to answer a question .