-1/2 a^{}_{c0,a0,a1,v0} b^{c1,c2,a2}_{} gamma1^{a1}_{a2} a+(c0) a+(a0) a+(v0) a-(c2) a-(c1)
+1/2 a^{}_{c1,a0,a1,v0} b^{c0,c1,a2}_{} a+(a0) a+(a1) a+(v0) a-(a2) a-(c0)
-a^{}_{c1,a0,a1,v0} b^{c0,c1,a2}_{} gamma1^{a1}_{a2} a+(a0) a+(v0) a-(c0)