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