-1/4 a^{c0,c1,a0}_{v0} b^{a3}_{c2,a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c2) a+(v0) a-(c1) a-(c0)
+1/2 a^{c0,c1,a2}_{v0} b^{a1}_{c2,a0,a3} eta1^{a3}_{a2} a+(c2) a+(a0) a+(v0) a-(a1) a-(c1) a-(c0)