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