1/2 a^{v1}_{a0} b^{c0,v0}_{a3,v1} c^{c1,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)
-1/2 a^{v1}_{a3} b^{c0,v0}_{a0,v1} c^{c1,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)