1/4 a^{a0}_{c0,c1} b^{a3}_{c2,a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(c1) a+(c2)
+1/2 a^{a2}_{c0,c1} b^{a1}_{c2,a0,a3} eta1^{a3}_{a2} a+(c0) a+(c1) a+(c2) a+(a0) a-(a1)