who are the five main 5 main ícones in snsd?

Yuri, Yonna, Taeyeon, Seohyun, Jessica

Yoona Jessica taeyeon hyoyeon yuri

1. Taeyeon, the leader, and the vocal leader
2. Hyoyeon, The dance leader
3. YoonA, the centre
4. Jessica, as the main vocal, she is the oldest trainer of sm ent
5. I think Tiffany,, maybe.. I don't know why...