-a^{v0}_{a0} b^{a2}_{c1} c^{c0,c1}_{a1,a3} eta1^{a3}_{a2} a+(a0) a+(a1) a-(v0) a-(c0)
+1/2 a^{v0}_{a2} b^{a3}_{c1} c^{c0,c1}_{a0,a1} gamma1^{a2}_{a3} a+(a0) a+(a1) a-(v0) a-(c0)