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