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