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