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