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