-1/2 a^{v0}_{c0,c1,a0} b^{a2}_{c2,a1,v0} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a-(a2)
+1/2 a^{v0}_{c0,c1,a1} b^{a2}_{c2,a0,v0} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(c2) a+(a0)
-1/2 a^{v0}_{c0,c1,a1} b^{a2}_{c2,a0,v1} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(c2) a+(a0) a+(v1) a-(v0)