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