1/2 a^{c0,c1}_{c4,a0} b^{c2,c4}_{a1,a3} c^{a4,v0}_{c3,a2} gamma1^{a3}_{a4} a+(c3) a+(a0) a+(a1) a+(a2) a-(v0) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1}_{c4,a3} b^{c2,c4}_{a0,a1} c^{a4,v0}_{c3,a2} gamma1^{a3}_{a4} a+(c3) a+(a0) a+(a1) a+(a2) a-(v0) a-(c2) a-(c1) a-(c0)