[ -2 ] [ 1 ] 
0 |-> 1
-1 |-> 1
f(z) = 1/2*z^3 - 1/2*z + 1
*
[ 1 ] [ -1/2 ] 
0 |-> 1
-1 |-> 1
f(z) = -4*z^3 + 4*z + 1
*
[ -5 ] [ 10 ] 
20 |-> -5
-15 |-> -5
f(z) = -1/250*z^3 + 13/10*z + 1
*
[ -5/4 ] [ 5/8 ] 
5/16 |-> 5/8
-15/16 |-> 5/8
f(z) = 256/125*z^3 - 7/5*z + 1
*
[ 1/4 ] [ -1/8 ] 
-1/16 |-> 1/4
-3/16 |-> 1/4
f(z) = -256*z^3 + 13*z + 1
*
TOTAL: 5