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