-1/2 a^{a0,a1}_{a3,v0} b^{a2}_{c1} c^{c1,a4}_{c0,v1} gamma1^{a3}_{a4} a+(c0) a+(v0) a+(v1) a-(a2) a-(a1) a-(a0)
+1/2 a^{a0,a1}_{a3,v0} b^{a4}_{c1} c^{c1,a2}_{c0,v1} gamma1^{a3}_{a4} a+(c0) a+(v0) a+(v1) a-(a2) a-(a1) a-(a0)