[ -2 ] 
2 |-> 4 |-> -2
-4 |-> 4
f(z) = -3/16*z^3 + 9/4*z + 1
*
[ 4 ] 
2 |-> -2 |-> 4
-4 |-> -2
f(z) = 3/16*z^3 - 9/4*z + 1
*
TOTAL: 2