-1/2 a^{}_{c0,a0,v0} b^{c0,a1,a2}_{v1} a+(a0) a+(v0) a+(v1) a-(a2) a-(a1)
-a^{}_{c0,a1,v0} b^{c0,a0,a2}_{v1} gamma1^{a1}_{a2} a+(v0) a+(v1) a-(a0)
+a^{}_{c0,a1,v0} b^{c1,a0,a2}_{v1} gamma1^{a1}_{a2} a+(c0) a+(v0) a+(v1) a-(a0) a-(c1)