-1/4 a^{}_{} b^{c2,a0}_{c0,c1} c^{c3,a3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(c1) a-(c3) a-(c2)
-1/2 a^{}_{} b^{c1,a0}_{c0,c2} c^{c2,a3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a-(c1)
-a^{}_{} b^{c1,a2}_{c0,c2} c^{c2,a1}_{a0,a3} eta1^{a3}_{a2} a+(c0) a+(a0) a-(a1) a-(c1)