-1/4 a^{v1,v2}_{a1,v0} b^{c0,a2}_{c4,a0} c^{c3,c4}_{c1,c2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(a0) a+(v0) a-(v2) a-(v1) a-(c3) a-(c0)