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def process_infile  old_table = CSV.open('file.csv','r')  old_table.each do |row|    # copy the row to x    x = row    # now that I have copied the row, how do I delete it from the array old_table?    # find the two other rows that correspond to x and extract them to y and z.        # use data from x, y, z to write a row in the new_table for newfile.csv  endend