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