question: In addition to the circumstances by which a state party joined a treaty , why might a treaty be invalidated ?
answer: the content of the treaty itself
turker_answer: In addition to the circumstances by which a state party joined a treaty , a treaty might be invalidated by the content of the treaty itself .
rule-based: In addition to the circumstances by which a state party joined a treaty , a treaty might be invalidated because of the content of the treaty itself .