I made a typo in the previous message,
SUNSimplify[SUNT[a].SUNT[b].SUNT[c].SUNT[a].SUNT[b].SUNT[c]]=
(-1/2*(C_A-2*C_F))^2*C_F- 1/2*C_A*(-1/2*(C_A-2*C_F))*C_F=
=(N^2+1)*(N^2-1)/(2N)^3.
Hrayr
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