1/4 a^{v1,v2}_{a0,v0} b^{c0,c1}_{a3,v2} c^{c2,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a+(v0) a-(v1) a-(c2) a-(c1) a-(c0)
-1/4 a^{v1,v2}_{a3,v0} b^{c0,c1}_{a0,v2} c^{c2,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a+(v0) a-(v1) a-(c2) a-(c1) a-(c0)