-1/2 a^{a0,v1}_{c0,v0} b^{}_{} c^{c0,a3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(v0) a-(v1)
-1/2 a^{a0,v1}_{c0,v0} b^{}_{} c^{c1,a3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(v0) a-(v1) a-(c1)
-a^{a2,v1}_{c0,v0} b^{}_{} c^{c0,a1}_{a0,a3} eta1^{a3}_{a2} a+(a0) a+(v0) a-(v1) a-(a1)