1/2 a^{c1,a0}_{c0,a2} b^{a1,v0}_{c2,c3} c^{a3}_{v0} gamma1^{a2}_{a3} a+(c0) a+(c2) a+(c3) a-(a1) a-(a0) a-(c1)
-1/2 a^{c1,a0}_{c0,a2} b^{a3,v0}_{c2,c3} c^{a1}_{v0} gamma1^{a2}_{a3} a+(c0) a+(c2) a+(c3) a-(a1) a-(a0) a-(c1)