1/2 a^{c1,c2}_{c0,a0} b^{v0,v1}_{a1,a2} c^{a3}_{v1} gamma1^{a2}_{a3} a+(c0) a+(a0) a+(a1) a-(v0) a-(c2) a-(c1)
+1/4 a^{c1,c2}_{c0,a2} b^{v0,v1}_{a0,a1} c^{a3}_{v1} gamma1^{a2}_{a3} a+(c0) a+(a0) a+(a1) a-(v0) a-(c2) a-(c1)