1/2 a^{c0,v1}_{a1,v0} b^{a0}_{v1} c^{c3,a2}_{c1,c2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(v0) a-(a0) a-(c3) a-(c0)
-1/2 a^{c0,v1}_{a1,v0} b^{a2}_{v1} c^{c3,a0}_{c1,c2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(v0) a-(a0) a-(c3) a-(c0)