Matrix t2*K(2) in Subspace 122 with Dimension 10

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

(-11*t*U)/2 (8*t^2 - U^2)/(2*Sqrt[3]) 0 2*Sqrt[2]*t^2 -((t*U)/Sqrt[2]) -(t*U)/2 -2*Sqrt[2]*t^2 -2*t*U -(Sqrt[2/3]*(4*t^2 + U^2)) (-5*t*U)/2
(8*t^2 - U^2)/(2*Sqrt[3]) (-11*t*U)/2 Sqrt[3]*t*U Sqrt[2/3]*t*U 0 (-4*t^2)/Sqrt[3] (t*U)/Sqrt[6] (2*U^2)/Sqrt[3] Sqrt[2]*t*U -(Sqrt[3]*U^2)/2
0 Sqrt[3]*t*U -4*t*U 2*Sqrt[2]*t*U Sqrt[2]*U^2 0 0 0 0 0
2*Sqrt[2]*t^2 Sqrt[2/3]*t*U 2*Sqrt[2]*t*U 0 -U^2 -2*Sqrt[2]*t^2 t*U 0 (4*t*U)/Sqrt[3] 0
-((t*U)/Sqrt[2]) 0 Sqrt[2]*U^2 -U^2 -6*t*U (-3*t*U)/Sqrt[2] 0 -(Sqrt[2]*t*U) 0 (-3*t*U)/Sqrt[2]
-(t*U)/2 (-4*t^2)/Sqrt[3] 0 -2*Sqrt[2]*t^2 (-3*t*U)/Sqrt[2] (-9*t*U)/2 (4*t^2 + U^2)/Sqrt[2] t*U 4*Sqrt[2/3]*t^2 (-3*t*U)/2
-2*Sqrt[2]*t^2 (t*U)/Sqrt[6] 0 t*U 0 (4*t^2 + U^2)/Sqrt[2] -5*t*U 0 (2*t*U)/Sqrt[3] 0
-2*t*U (2*U^2)/Sqrt[3] 0 0 -(Sqrt[2]*t*U) t*U 0 -5*t*U Sqrt[2/3]*U^2 -2*t*U
-(Sqrt[2/3]*(4*t^2 + U^2)) Sqrt[2]*t*U 0 (4*t*U)/Sqrt[3] 0 4*Sqrt[2/3]*t^2 (2*t*U)/Sqrt[3] Sqrt[2/3]*U^2 -2*t*U 0
(-5*t*U)/2 -(Sqrt[3]*U^2)/2 0 0 (-3*t*U)/Sqrt[2] (-3*t*U)/2 0 -2*t*U 0 (-15*t*U)/2