-a^{c0}_{a0} b^{a3,v0}_{c1,a1} c^{c1,v1}_{a2,a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(c0)
-1/2 a^{c0}_{a3} b^{a4,v0}_{c1,a0} c^{c1,v1}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(c0)