Matrix t2*K(2) in Subspace 160 with Dimension 4

(K(2) is the second-order Grosse operator)

-3*t*U -(Sqrt[2]*U^2) 3*Sqrt[2]*t*U 4*t^2
-(Sqrt[2]*U^2) 0 t^2*(-4 - U^2/t^2) -2*Sqrt[2]*t*U
3*Sqrt[2]*t*U t^2*(-4 - U^2/t^2) -2*t*U 0
4*t^2 -2*Sqrt[2]*t*U 0 -4*t*U