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