Matrix t2*K(2) in Subspace 77 with Dimension 4

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

-9*t*U t^2*(-4 - U^2/t^2) -(Sqrt[2]*U^2) 2*Sqrt[2]*t*U
t^2*(-4 - U^2/t^2) -7*t*U -3*Sqrt[2]*t*U 0
-(Sqrt[2]*U^2) -3*Sqrt[2]*t*U -6*t*U 4*t^2
2*Sqrt[2]*t*U 0 4*t^2 -5*t*U