-1/4 a^{c0,v0}_{a0,a1} b^{a3}_{a2} c^{c1,c2}_{a4,v0} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)
+1/2 a^{c0,v0}_{a0,a3} b^{a4}_{a1} c^{c1,c2}_{a2,v0} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)