1/2 a^{c0,c1}_{c3,a0} b^{c2,c3}_{a1,a3} c^{a4,v1}_{a2,v0} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a+(v0) a-(v1) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1}_{c3,a3} b^{c2,c3}_{a0,a1} c^{a4,v1}_{a2,v0} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a+(v0) a-(v1) a-(c2) a-(c1) a-(c0)