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