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