1/6 a^{a1,a2}_{c0,a0} b^{}_{c1,c2,c3,a3} eta1^{a3}_{a2} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a-(a1)
-1/12 a^{a1,a2}_{c0,a0} b^{}_{c1,c2,c3,a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a+(c2) a+(c3)