A=Bilangan asli kurang dari 9 B=Bilangan asli

A {1,2,3,4,5,6, 7,8}
B {1,2,3,4,5,6,7,8,9,10,11,12,13………}

A = {1,2,3,4,5,6,7,8}
B = {1,2,3,4,5,6,7,8,9,10,…} (Bilangan bulat positif yang bukan 0)