1/4 a^{a0,a1}_{a2,v0} b^{c0,a3}_{c4,v1} c^{c3,c4}_{c1,c2} gamma1^{a2}_{a3} a+(c1) a+(c2) a+(v0) a+(v1) a-(a1) a-(a0) a-(c3) a-(c0)