-a^{a0}_{c2} b^{c0,c2}_{a2,v0} c^{a1,a3}_{c1,v1} gamma1^{a2}_{a3} a+(c1) a+(v0) a+(v1) a-(a1) a-(a0) a-(c0)
+1/2 a^{a2}_{c2} b^{c0,c2}_{a3,v0} c^{a0,a1}_{c1,v1} eta1^{a3}_{a2} a+(c1) a+(v0) a+(v1) a-(a1) a-(a0) a-(c0)