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