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