1/4 a^{v1}_{a0,a1,v0} b^{a4}_{a2,a3,v1} a+(a0) a+(a1) a+(a2) a+(a3) a+(v0) a-(a4)
-1/2 a^{v1}_{a0,a3,v0} b^{a4}_{a1,a2,v1} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a+(v0)
+1/2 a^{v1}_{a0,a3,v0} b^{a4}_{a1,a2,v2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a+(v0) a+(v2) a-(v1)