-1/2 a^{a1,a2}_{c0,a0} b^{}_{} c^{c2,v0}_{c1,a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a-(v0) a-(c2)
-a^{a1,a2}_{c1,a0} b^{}_{} c^{c1,v0}_{c0,a3} eta1^{a3}_{a2} a+(c0) a+(a0) a-(v0) a-(a1)
-1/2 a^{a1,a2}_{c1,a0} b^{}_{} c^{c1,v0}_{c0,a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a-(v0)