-1/2 a^{c0,c1}_{a0,v0} b^{c2,v2}_{a1,v1} c^{a2}_{v2} gamma1^{a1}_{a2} a+(a0) a+(v0) a+(v1) a-(c2) a-(c1) a-(c0)
+1/2 a^{c0,c1}_{a1,v0} b^{c2,v2}_{a0,v1} c^{a2}_{v2} gamma1^{a1}_{a2} a+(a0) a+(v0) a+(v1) a-(c2) a-(c1) a-(c0)