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spec: The views I am going to express are my own , and do not necessarily reflect those of the Commission , the Commissioners , or others members of the staff . Also , the music is more sectional , with clearly defined arias , ensemble pieces , and choruses . The radioactive tracer commonly used in this test is iodine . But before I go on , I must remind you of the standard disclaimer that my remarks today are my own , and do not necessarily represent the views of the Commission , the Commissioners , or other members of the Commission 's staff .