Lance: If experience teaches us nothing else, it teaches us that every general rule has at least one exception. Frank: What you conclude is itself a general rule. If we assume that it is true, then there is at least one general rule that has no exceptions. Ttherefore, you must withdraw your conclusion. Frank's argument is an attempt to counter Lance's conclusion by ['demonstrating that Lance assumes the very thing he sets out to prove', 'establishing that experience teaches us the opposite of what Lance concludes', "showing that Lance's conclusion involves him in a contradiction", 'showing that it has no implications for any real cases']