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b. S = {(1,1);(2,2);(3,3}; (4,4) ;(5,5);(6,6)} n(s) = 6
c. S = {(2,1) (3,1) (4,1);(5,1);(6,1);(3,2);(4,2);(5,2);(6,2);(4,3)(5,3)(6,3)(5,4),(6,4) (6,5)} n(s) = 15