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