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