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