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