-1/2 a^{}_{a0,a1,v0} b^{a3,a4,v1}_{a2} lambda2^{a1,a2}_{a3,a4} a+(a0) a+(v0) a-(v1)
+a^{}_{a0,a3,v0} b^{a2,a4,v1}_{a1} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(v0) a-(v1) a-(a2)
-1/2 a^{}_{a1,a2,v0} b^{a3,a4,v1}_{a0} gamma1^{a2}_{a4} gamma1^{a1}_{a3} a+(a0) a+(v0) a-(v1)
-1/4 a^{}_{a1,a2,v0} b^{a3,a4,v1}_{a0} lambda2^{a1,a2}_{a3,a4} a+(a0) a+(v0) a-(v1)