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