1/4 a^{c0,c1}_{a1,v0} b^{c3,a0}_{c2,c4} c^{c4,a2}_{v1,v2} gamma1^{a1}_{a2} a+(c2) a+(v0) a+(v1) a+(v2) a-(a0) a-(c3) a-(c1) a-(c0)
-1/4 a^{c0,c1}_{a1,v0} b^{c3,a2}_{c2,c4} c^{c4,a0}_{v1,v2} gamma1^{a1}_{a2} a+(c2) a+(v0) a+(v1) a+(v2) a-(a0) a-(c3) a-(c1) a-(c0)