A U B {1,2,3,4,5,9}
A amp; B {1,3}
A/B {2,4}
B/A {5,9}
A x B {(1,1)(1,3)(1,5)(1,9)(2,1)2,3)(2,5)(2,9)(3,1)(3,3)(3,5)(3,9)(4,1)(4,3)(4,5)(4,9)}