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