1/2 a^{a0,a1,v1}_{v0} b^{a4}_{a2,a3} lambda2^{a2,a3}_{a1,a4} a+(v0) a-(v1) a-(a0)
+a^{a0,a3,v1}_{v0} b^{a2}_{a1,a4} eta1^{a4}_{a3} a+(a1) a+(v0) a-(v1) a-(a2) a-(a0)
+1/2 a^{a1,a2,v1}_{v0} b^{a0}_{a3,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(v0) a-(v1) a-(a0)
+1/4 a^{a1,a2,v1}_{v0} b^{a0}_{a3,a4} lambda2^{a3,a4}_{a1,a2} a+(v0) a-(v1) a-(a0)