-1/2 a^{c0,v0}_{a0,a3} b^{a4,v2}_{a1,a2} c^{v1}_{v2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(c0)
+1/2 a^{c0,v2}_{a0,a3} b^{a4,v0}_{a1,a2} c^{v1}_{v2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(c0)