[ 5/6 ] [ -5/6 ] [ 0 ]
-1/2 |-> -1/6 |-> 0
1/2 |-> 1/6 |-> 0
f(z) = 3/2*z^3 - 1/24*z
*
[ 7/5 ] [ -7/5 ] [ 0 ]
-2/5 |-> -8/5 |-> 0
2/5 |-> 8/5 |-> 0
f(z) = -5/3*z^3 + 64/15*z
*
[ 11/12 ] [ -11/12 ] [ 0 ]
-5/12 |-> -1/12 |-> 0
5/12 |-> 1/12 |-> 0
f(z) = 6/5*z^3 - 1/120*z
*
TOTAL: 3