-a^{c1,a1}_{c0,v0} b^{a0,v1}_{c3,a2} c^{c3}_{c2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(v0) a-(v1) a-(a0) a-(c1)
+a^{c0,a1}_{c3,v0} b^{a0,v1}_{c1,a2} c^{c3}_{c2} eta1^{a2}_{a1} a+(c1) a+(c2) a+(v0) a-(v1) a-(a0) a-(c0)