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