-1/2 a^{c0}_{a1} b^{a0}_{c1} c^{c1,a2}_{v0,v1} gamma1^{a1}_{a2} a+(v0) a+(v1) a-(a0) a-(c0)
+1/2 a^{c0}_{a1} b^{a2}_{c1} c^{c1,a0}_{v0,v1} gamma1^{a1}_{a2} a+(v0) a+(v1) a-(a0) a-(c0)