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You should write a program processing those Excel files. Though many programming languages provide API to read data from Excel files, you still need to write code to open each file, traverse cells to read desired data, input all data into memory and store it in one data set object, usually use Python to convert a sheet into a dataframe with pandas. But using ...


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Looks like this hasn't been touched in a while. My thoughts are based one key observation - misunderstanding of what a DFD is, by the original poster and all of the responses. A flowchart is not a DFD. Fundamentally, a DFD has only a very few symbols: A data store (any type) drawn as two parallel horizontal lines with the description of the type of data ...


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