在生活中经常会听到累计应纳税所得额，很多人不知道它是什么意思，接下来给大家具体说一下。
I have a data.frame in R; it\'s called p. Each element in the data.frame is either True or False. My variable p has, say, m rows and n columns. For every row there is strictly only one TRUE element.
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