1/4 a^{c0,c1}_{a0,a1} b^{v0}_{a3} c^{c2,a4}_{a2,v0} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)
-1/2 a^{c0,c1}_{a0,a3} b^{v0}_{a1} c^{c2,a4}_{a2,v0} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)