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