1/4 a^{c0,v0}_{a0,a1} b^{c1,c2}_{a2,v0} c^{a3}_{c3} gamma1^{a2}_{a3} a+(c3) a+(a0) a+(a1) a-(c2) a-(c1) a-(c0)
-1/2 a^{c0,v0}_{a0,a2} b^{c1,c2}_{a1,v0} c^{a3}_{c3} gamma1^{a2}_{a3} a+(c3) a+(a0) a+(a1) a-(c2) a-(c1) a-(c0)