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