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