-a^{c1,a1}_{c0,c2} b^{c2}_{a0} c^{v0}_{a2} eta1^{a2}_{a1} a+(c0) a+(a0) a-(v0) a-(c1)
+a^{c1,a1}_{c0,c2} b^{c2}_{a2} c^{v0}_{a0} eta1^{a2}_{a1} a+(c0) a+(a0) a-(v0) a-(c1)