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