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