1/4 a^{a1}_{c0,c1} b^{a4}_{a0,a2,a3} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(c1) a+(a0)
+1/4 a^{a3}_{c0,c1} b^{a2}_{a0,a1,a4} eta1^{a4}_{a3} a+(c0) a+(c1) a+(a0) a+(a1) a-(a2)