-1/2 a^{c0,v0}_{c1,a0} b^{v1}_{a3} c^{c1,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(c0)
+1/2 a^{c0,v0}_{c1,a3} b^{v1}_{a0} c^{c1,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(c0)