-1/2 a^{}_{c0,a0} b^{c1,c2,a1}_{v0} gamma1^{a0}_{a1} a+(c0) a+(v0) a-(c2) a-(c1)
-a^{}_{c1,a0} b^{c0,c1,a1}_{v0} a+(a0) a+(v0) a-(a1) a-(c0)
+a^{}_{c1,a0} b^{c0,c1,a1}_{v0} gamma1^{a0}_{a1} a+(v0) a-(c0)