Easy difficulty hints, answers for Feb. 27 PipsEqual (6): Everything in this purple space must be equal to 6. The answer is 6-0, placed horizontally; 6-3, placed vertically.
（作者单位：北京大学考古文博学院）
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drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.，这一点在搜狗输入法下载中也有详细论述
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