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a = ["钢铁侠", "绿巨人", "蜘蛛侠"] a.append("黑豹")
["钢铁侠","绿巨人","蜘蛛侠"]
["钢铁侠","绿巨人","蜘蛛侠","黑豹"]
["钢铁侠","绿巨人","蜘妹侠","钢铁侠"]
["钢铁侠"]