I
u
11
= h2u
3
− 2u
2
+ d + 5u − 4, u
3
+ c + 2u + 1, u
3
− u
2
+ b + 3u − 1, a + 1, u
4
− u
3
+ 3u
2
− 2u + 1i
I
u
12
= hd − u + 1, c − 1, b, a − u, u
2
+ 1i
I
u
13
= hd + 1, c, b + u, a − 1, u
2
+ 1i
I
u
14
= hd + u + 1, c − 1, b + u, a − 1, u
2
+ 1i
I
u
15
= hda + a + u + 1, c − 1, b + u, u
2
+ 1i
I
v
1
= ha, d − 1, −av + c − v −1, b + v, v
2
+ 1i
* 15 irreducible components of dim
C
= 0, with total 60 representations.
* 1 irreducible components of dim
C
= 1
2
All coefficients of polynomials are rational numbers. But the coefficients are sometimes approximated
in decimal forms when there is not enough margin.
2