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One question per month
To the reader: We have completed 4 issues in this column, and we have four questions, namely, P74 in the first phase, P17 in the second phase, P61 in the third phase, and P14 in the fourth phase. Recently, we have received responses from some readers. Readers are requested to mail or send their answers to us (please specify "one monthly question"). For quick and accurate answers, we will give certain rewards on a regular basis. The reference answer will also be given in subsequent periods.