1/8 a^{v0,v1}_{a0,a1} b^{c0,v2}_{c3,a2} c^{c3,a3}_{c1,c2} gamma1^{a2}_{a3} a+(c1) a+(c2) a+(a0) a+(a1) a-(v2) a-(v1) a-(v0) a-(c0)
-1/4 a^{v0,v1}_{a0,a2} b^{c0,v2}_{c3,a1} c^{c3,a3}_{c1,c2} gamma1^{a2}_{a3} a+(c1) a+(c2) a+(a0) a+(a1) a-(v2) a-(v1) a-(v0) a-(c0)