-1/2 a^{a1}_{v0} b^{a4}_{a0,a2,a3} lambda2^{a2,a3}_{a1,a4} a+(a0) a+(v0)
+1/2 a^{a3}_{v0} b^{a2}_{a0,a1,a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(v0) a-(a2)