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