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