1/2 a^{c0,c1}_{a0,v0} b^{c3,v2}_{c2,a2} c^{a3,v1}_{a1,v2} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(a1) a+(v0) a-(v1) a-(c3) a-(c1) a-(c0)
-1/2 a^{c0,c1}_{a2,v0} b^{c3,v2}_{c2,a0} c^{a3,v1}_{a1,v2} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(a1) a+(v0) a-(v1) a-(c3) a-(c1) a-(c0)