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