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