-a^{a0}_{c0} b^{c2,a1}_{c1,c3} c^{c3}_{a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)
+a^{a1}_{c0} b^{c2,a0}_{c1,c3} c^{c3}_{a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)
+a^{a0}_{c1} b^{c1,a1}_{c0,c2} c^{c2}_{a2} a+(c0) a+(a2) a-(a1) a-(a0)
-a^{a0}_{c1} b^{c1,a1}_{c0,c2} c^{c2}_{a2} eta1^{a2}_{a1} a+(c0) a-(a0)
+a^{a1}_{c1} b^{c1,a0}_{c0,c2} c^{c2}_{a2} eta1^{a2}_{a1} a+(c0) a-(a0)
-1/2 a^{a0}_{c3} b^{c2,a1}_{c0,c1} c^{c3}_{a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)
+1/2 a^{a0}_{c3} b^{c3,a1}_{c0,c1} c^{c2}_{a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)
+1/2 a^{a1}_{c3} b^{c2,a0}_{c0,c1} c^{c3}_{a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)
-1/2 a^{a1}_{c3} b^{c3,a0}_{c0,c1} c^{c2}_{a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)