-a^{c0}_{a0} b^{v0,v2}_{a1,a2} c^{a3,v1}_{c1,v2} gamma1^{a2}_{a3} a+(c1) a+(a0) a+(a1) a-(v1) a-(v0) a-(c0)
-1/2 a^{c0}_{a2} b^{v0,v2}_{a0,a1} c^{a3,v1}_{c1,v2} gamma1^{a2}_{a3} a+(c1) a+(a0) a+(a1) a-(v1) a-(v0) a-(c0)