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