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- A patient has an inoperable tumor in his abdomen. The tumor is inoperable because it is surrounded by healthy but fragile tissue that would be severely damaged during surgery.The goal state:- A patient without the tumor and with undamaged surrounding tissueThe current state: - A patient with an inoperable tumor surrounded by fragile tissueThe difference:- The tumorA direct-means solution:- To destroy the tumor with x-rays - The required x-ray dose would destroy the fragile surrounding tissue and possibly kill the patientA subgoal: - Modify the x-ray machine to deliver a weaker dose - This wouldn't work The x-ray wouldn't damage the tissue, but it also wouldn't damage the tumor

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