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