a^{a1}_{a0} b^{c1,v0}_{c0,a2} c^{c2}_{v0} eta1^{a2}_{a1} a+(c0) a+(a0) a-(c2) a-(c1)
+a^{a1}_{a0} b^{c0,v0}_{c1,a2} c^{c1}_{v0} a+(a0) a+(a2) a-(a1) a-(c0)
-a^{a1}_{a0} b^{c0,v0}_{c1,a2} c^{c1}_{v0} eta1^{a2}_{a1} a+(a0) a-(c0)
+a^{a1}_{a0} b^{c0,v0}_{c1,a2} c^{c1}_{v1} eta1^{a2}_{a1} a+(a0) a+(v1) a-(v0) a-(c0)