 SU2 gauge self-interaction vertices

For field strength $F_{\mu \nu }^a=f_{\mu \nu }^a-g{ϵ}^{abc}{A}_{\mu }^b{A}_{\nu }^c$, the square produces ${\mathcal{L}}_3=g{ϵ}^{abc}({\partial }_{\mu }{A}_{\nu }^a)A^{b\mu }{A}^{c\nu }$ and ${\mathcal{L}}_4=-g^2{ϵ}^{abc}{ϵ}^{ade}{A}_{\mu }^b{A}_{\nu }^c{A}^{d\mu }{A}^{e\nu }/4$. The cubic Feynman vertex has one derivative; the quartic one has none. No higher pure-gauge vertex occurs.