1/2 a^{c0,a0}_{c2,a1} b^{c1,a2}_{v0,v1} c^{c2}_{v2} gamma1^{a1}_{a2} a+(v0) a+(v1) a+(v2) a-(a0) a-(c1) a-(c0)
-1/2 a^{c0,a0}_{c2,a1} b^{c2,a2}_{v0,v1} c^{c1}_{v2} gamma1^{a1}_{a2} a+(v0) a+(v1) a+(v2) a-(a0) a-(c1) a-(c0)