Python: nested list and *operator with lists.

Question

Can anyone explain why the output of this code is 9 ?

x=[0,[2,4,6],[13,11,9]]
y=x[2]+x[1]*2
print(y[x[1][0]])

Answer 1

x[1][0]=2
y[2]=9 because y starts with 13, 11, 9...