* Cowpea;

data cowpea;



        b1          b2           b3

    -------------------------------------

    r1 r2 r3 r4  r1 r2 r3 r4  r1 r2 r3 r4

-----------------------------------------

a1  56 45 43 46  60 50 45 48  66 57 50 50

a2  65 61 60 63  60 58 56 60  53 53 48 55

a3  60 61 50 53  62 68 67 60  73 77 77 65