1/4 a^{c0,a0}_{a1,v0} b^{v2,v3}_{c3,v1} c^{c3,a2}_{c1,c2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(v0) a+(v1) a-(v3) a-(v2) a-(a0) a-(c0)