8.46.* In an ordinal table, to calculate the number of concordant pairs C, start at the corner of the table for the low level for each variable. Multiply that cell count by the count in every cell that is higher on both variables. Similarly, for every other cell, multiply the cell count by the counts in cells that are higher on both variables. Then C is the sum of these products. Explain how to calculate the total number of discordant pairs D.