[ -2 ] [ 2 ] [ 0 ]
-1 |-> 2
1 |-> -2
f(z) = z^3 - 3*z
*
[ 1/2 ] [ -1/2 ] [ 0 ]
-1 |-> 1/2
1 |-> -1/2
f(z) = -2*z^3 + 3/2*z
*
TOTAL: 2