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e when confused graduate students needed help. and finally i would like to thank the washington university faculty members who served as our instructors, mentors, and friends. as i think back on the sevenandahalf years i spent at washington university, my mind is filled with memories, happy, sad, frustrating, and even humorous. tonight i would like to share with you some of the memories that i take with me as i leave washington university. i take with me the memory of my office on the fourth floor of lopata hall the room at the end of the hallway that was too hot in summer, too cold in winter, and always to