my key: too many rabbits will eat up most of foods billy depends on.
45. City officer: five year ago we changed something in hospital A; today we see the positive result--less cost per paitient in A than in other hospital unchanged. so we should apply same changes to the others.
Assumption: hospital A does not move those patients in severe condition(more cost) to the others.
（责任编辑：申月月）
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