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