请解释为什么第三个人会这样回答，并分析每个人的推理过程。
The benefits of vaccination are well documented. The AstraZeneca Covid jab is credited with saving millions of lives. And yet for those who were harmed by the jab, the resulting injuries are devastating.
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How to reproduce
四步口诀：倒着来 → 弹 ≤ 当前的 → 栈顶即答案 → 当前入栈。