-1/4 a^{a0}_{a3} b^{a1,a2}_{c0,v0} c^{c0,a4}_{v1,v2} gamma1^{a3}_{a4} a+(v0) a+(v1) a+(v2) a-(a2) a-(a1) a-(a0)
+1/2 a^{a0}_{a3} b^{a1,a4}_{c0,v0} c^{c0,a2}_{v1,v2} gamma1^{a3}_{a4} a+(v0) a+(v1) a+(v2) a-(a2) a-(a1) a-(a0)