// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
Medium difficulty hints, answers for Feb. 27 PipsNumber (4): Everything in this space must add up to 4. The answer is 2-1, placed horizontally; 2-2, placed vertically.
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Latest US-Iran nuclear talks conclude with claims of ‘significant progress’
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