-a^{v1,v2}_{c0,v0} b^{c1,a0}_{a1,v2} c^{a2}_{c2} gamma1^{a1}_{a2} a+(c0) a+(c2) a+(v0) a-(v1) a-(a0) a-(c1)
-a^{v1,v2}_{c1,v0} b^{c1,a1}_{a0,v2} c^{a2}_{c0} a+(c0) a+(a0) a+(v0) a-(v1) a-(a2) a-(a1)
-a^{v1,v2}_{c1,v0} b^{c1,a0}_{a1,v2} c^{a2}_{c0} gamma1^{a1}_{a2} a+(c0) a+(v0) a-(v1) a-(a0)
+1/2 a^{v1,v2}_{c1,v0} b^{c1,a0}_{a1,v3} c^{a2}_{c0} gamma1^{a1}_{a2} a+(c0) a+(v0) a+(v3) a-(v2) a-(v1) a-(a0)