-1/2 a^{}_{c0,c1,a1,v0} b^{c3,a2}_{c2,a0} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(c2) a+(a0) a+(v0) a-(c3)
+a^{}_{c0,c2,a0,v0} b^{c2,a2}_{c1,a1} a+(c0) a+(c1) a+(a0) a+(a1) a+(v0) a-(a2)
+a^{}_{c0,c2,a1,v0} b^{c2,a2}_{c1,a0} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(a0) a+(v0)