2 4 6 8 union 2 3 5 7
2 4 6 8 3 5 7
   2 4 6 8 intersection 2 3 5 7
2
   2 4 6 8 difference 2 3 5 7
4 6 8
   2 4 6 8 subset 2 3 5 7
0
   '' subset 2 3 5 7
1
   2 4 6 8 3 5 7 equality 8 7 6 5 4 3 2
1