[ 1/6 ] [ -1/6 ] [ 7/6 -7/6 ] [ 0 ]
-5/6 |-> 0
5/6 |-> 0
f(z) = -3/2*z^3 + 25/24*z
*
[ 1/6 -1/6 ] [ 7/6 ] [ -7/6 ] [ 0 ]
-5/6 |-> 0
5/6 |-> 0
f(z) = 3/2*z^3 - 25/24*z
*
[ 7/20 ] [ -7/20 ] [ 23/20 -23/20 ] [ 0 ]
-17/20 |-> 0
17/20 |-> 0
f(z) = -5/3*z^3 + 289/240*z
*
[ 7/20 -7/20 ] [ 23/20 ] [ -23/20 ] [ 0 ]
-17/20 |-> 0
17/20 |-> 0
f(z) = 5/3*z^3 - 289/240*z
*
TOTAL: 4