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