1/2 a^{c1,a0}_{c0,a2} b^{a1,v2}_{v0,v1} c^{a3}_{v2} gamma1^{a2}_{a3} a+(c0) a+(v0) a+(v1) a-(a1) a-(a0) a-(c1)
-1/2 a^{c1,a0}_{c0,a2} b^{a3,v2}_{v0,v1} c^{a1}_{v2} gamma1^{a2}_{a3} a+(c0) a+(v0) a+(v1) a-(a1) a-(a0) a-(c1)