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