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There are definitely game situations where I can see this little guy becoming a powerhouse . For wealthy celebrities who are sick , the promotion of research becomes a reason to live , a cause that gives their hard lives a seemingly noble purpose . On the other hand if the arc leads to a vertex that has already been seen , the arc becomes a non-tree arc and the current vertex does n't change . The Bush family , long tied to the Saudis , is fair game once the " Forbidden Truth " conspiracy theory becomes the conventional wisdom : George Herbert Walker Bush , reviled by some for his pro - " Arabist " policies , is the particular target of this left-wing hate campaign . If it does , the arc becomes a tree arc ; the previously unseen vertex becomes active , and it becomes the new current vertex . Discipline was much less of an issue and active learning became the center focus of our classroom activities .