S2 t t2 s

S2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 sS2 t t2 s