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