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The second joint reply contends that the substantive arguments advanced by the two petitioners are erroneous . After each pair is played , the child is asked to explain how the two pieces differed . The dividing line thus established shall , in all time , be faithfully respected by the two governments , without any variation therein , unless of the express and free consent of the two , given in conformity to the principles of the law of nations , and in accordance with the constitution of each country respectively .