\right. \nonumber \\
&& \left. ~~~~~~~~~~-~ \left( 10368 \zeta(3) + 6256 \right) C_A C_F T_F {N_{\!f}}+ \left( 10368 \zeta(3) - 560 \right) C_F^3 \right. \nonumber \\
&& \left. ~~~~~~~~~~+~ \left( 10368 \zeta(3) - 6824 \right) C_F^2 T_F {N_{\!f}}- 896 C_F T_F^2 {N_{\!f}}^2 \right] a^3 ~+~ O(a^4) ~, \nonumber \\
\gamma^{W_2}_{12}(a) &=& -~ \frac{4}{3} C_F a ~+~ \frac{1}{27}
\left[ 56 C_F^2 - 188 C_A C_F + 64 C_F T_F {N_{\!f}}\right] a^2 \nonumber \\
&& +~ \frac{1}{243} \left[ \left( 7776 \zeta(3) + 4264 \right) C_A C_F^2
- \left( 2592 \zeta(3) + 10460 \right) C_A^2 C_F \right. \nonumber \\
&& \left. ~~~~~~~~~~+~ \left( 5184 \zeta(3) + 3128 \right) C_A C_F T_F {N_{\!f}}- \left( 5184 \zeta(3) - 280 \right) C_F^3 \right. \nonumber \\
&& \left. ~~~~~~~~~~-~ \left( 5184 \zeta(3) - 3412 \right) C_F^2 T_F {N_{\!f}}+ 448 C_F T_F^2 {N_{\!f}}^2 \right] a^3 ~+~ O(a^4) ~, \nonumber \\
\gamma^{W_2}_{22}(a) &=& O(a^4)
\label{anom2}\end{aligned}$$ and $$\begin{aligned}
\gamma^{W_3}_{11}(a) &=& \frac{25}{6} C_F a ~+~ \frac{1}{432} \left[
8560 C_A C_F - 2035 C_F^2 - 3320 C_F T_F {N_{\!f}}\right] a^2 \nonumber \\
&& +~ \frac{1}{15552} \left[ \left( 285120 \zeta(3) + 1778866 \right) C_A^2 C_F
- \left( 855360 \zeta(3) + 311213 \right) C_A C_F^2 \right. \nonumber \\
&& \left. ~~~~~~~~~~~~~-~ \left( 1036800 \zeta(3) 