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