Which of the following are true?

1. {3, 2, 1}  {3, 1}
   
   
2. {2}  {1, 2, 3}
   
   
3. a {5, 6, {a }, 9}
   
   
4. 1  {{1}, {3}, {2}}
   
   
5. {4, 2} {10, 4, 8, 6, 12,  24}
   
   
6. {3, 2, 3, 1}  {1, 2, 3, 4}
   
   
7. {3, 2}  {2, 3}
   
   
8. {3, 2, 3}  {2, 3}