a^{c1}_{c0} b^{a0}_{c4} c^{c3,c4}_{c2,a1} eta1^{a1}_{a0} a+(c0) a+(c2) a-(c3) a-(c1)
+a^{c0}_{c2} b^{a0}_{c3} c^{c2,c3}_{c1,a1} a+(c1) a+(a1) a-(a0) a-(c0)
-a^{c0}_{c2} b^{a0}_{c3} c^{c2,c3}_{c1,a1} eta1^{a1}_{a0} a+(c1) a-(c0)
-a^{c0}_{c4} b^{a0}_{c1} c^{c3,c4}_{c2,a1} eta1^{a1}_{a0} a+(c1) a+(c2) a-(c3) a-(c0)