paper card, often the same dimensions as a modern credit card, but with punched
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* 核心逻辑：能看到的人数 = 弹出的矮个子数量（count） + （栈顶有更高的人则+1，否则+0）
Now scientists are directly linking the uncontrolled rocket re-entry to a plume of lithium measured less than 100km above Earth.