1/2 a^{c0,v1}_{a0,v0} b^{c3,v2}_{c1,c2} c^{a1}_{v2} gamma1^{a0}_{a1} a+(c1) a+(c2) a+(v0) a-(v1) a-(c3) a-(c0)
-1/2 a^{c0,v2}_{a0,v0} b^{c3,v1}_{c1,c2} c^{a1}_{v2} gamma1^{a0}_{a1} a+(c1) a+(c2) a+(v0) a-(v1) a-(c3) a-(c0)