-1/8 a^{c0,c1}_{a0,a3} b^{a4,v0}_{a1,a2} c^{c3,c4}_{c2,v0} gamma1^{a3}_{a4} a+(c2) a+(a0) a+(a1) a+(a2) a-(c4) a-(c3) a-(c1) a-(c0)