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