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