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Suppose you see the following price quotation for XYZ stock options:

                       Calls                           Puts
              -----------------------         -----------------------
exercise      Mar       Jun       Sep         Mar       Jun       Sep
price
40            4         5         6           1        2 1/2      3
45            3        4 1/2      5         1 1/4      2 1/2    3 1/2
50          2 1/2       3         4         1 1/2      3          4
55            1        2 1/2    3 1/4         4        5 1/2    6 1/4
60            1         2         3         8 1/2      9 1/4     10
How many option series are there in this table? display some help (Click here for help)