-1/2 a^{v0,v1}_{c1,a0} b^{c1,v2}_{a1,a2} c^{a3}_{c0} gamma1^{a2}_{a3} a+(c0) a+(a0) a+(a1) a-(v2) a-(v1) a-(v0)
-1/4 a^{v0,v1}_{c1,a2} b^{c1,v2}_{a0,a1} c^{a3}_{c0} gamma1^{a2}_{a3} a+(c0) a+(a0) a+(a1) a-(v2) a-(v1) a-(v0)