-1/2 a^{v2}_{a0} b^{c0,c1}_{a1,a2} c^{a3,v1}_{v0,v2} gamma1^{a2}_{a3} a+(a0) a+(a1) a+(v0) a-(v1) a-(c1) a-(c0)
-1/4 a^{v2}_{a2} b^{c0,c1}_{a0,a1} c^{a3,v1}_{v0,v2} gamma1^{a2}_{a3} a+(a0) a+(a1) a+(v0) a-(v1) a-(c1) a-(c0)