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