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Enrollment as an auditor is subject to the permission of the instructor , and only after students otherwise eligible to enroll in the course on a credit basis have had an opportunity to do so . Further , Reverse Path transportation , as defined in Section 2.9 ( b ) , is subject to the operating conditions of Seller 's pipeline and will not be made available to Buyer if Seller , in Seller 's sole discretion , determines that such transportation is operationally infeasible . On arrival at the laboratory , subjects were greeted by a male experimenter who gave them a brief oral introduction to the experiment , provided them with complete written instructions , and then escorted each subject to a cubicle ( equipped with video monitor ) where she remained for the duration of the experiment . On arrival at the laboratory , subjects were greeted by a female experimenter who gave them a brief oral introduction to the experiment , provided them with complete written instructions , and then escorted each subject to a cubicle equipped with headphones that were connected to a tape player in another room . Further , Reverse Path transportation , as defined in Section 2.6 ( b ) , is subject to the operating conditions of Seller 's pipeline and will not be made available to Buyer if Seller , in Seller 's sole discretion , determines that such transportation is operationally infeasible . Further , Reverse Path transportation , as defined in Section 2.5 ( b ) , is subject to the operating conditions of Seller s pipeline and will not be made available to Buyer if Seller , in Seller s sole discretion , determines that such transportation is operationally infeasible .