1. { }
2. {2}
3. {3}
4. {4}
5. {6}
6. {2, 3}
7. {2, 4}
8. {2, 6}
9. {3, 4}
10. {3, 6}
11. {4,6}
12. {2, 3, 4}
13. {2, 3, 6}
14. {2, 4, 6}
15. {3, 4, 6}
16. {2, 3, 4, 6}
Total subsets: 16