1/4 a^{c1,a2}_{c0,c4} b^{c2,c3}_{a0,a1} c^{c4}_{a3} eta1^{a3}_{a2} a+(c0) a+(a0) a+(a1) a-(c3) a-(c2) a-(c1)
-1/2 a^{c1,a2}_{c0,c4} b^{c2,c4}_{a0,a1} c^{c3}_{a3} eta1^{a3}_{a2} a+(c0) a+(a0) a+(a1) a-(c3) a-(c2) a-(c1)
-1/2 a^{c1,a2}_{c0,c4} b^{c2,c3}_{a0,a3} c^{c4}_{a1} eta1^{a3}_{a2} a+(c0) a+(a0) a+(a1) a-(c3) a-(c2) a-(c1)
+a^{c1,a2}_{c0,c4} b^{c2,c4}_{a0,a3} c^{c3}_{a1} eta1^{a3}_{a2} a+(c0) a+(a0) a+(a1) a-(c3) a-(c2) a-(c1)
-1/2 a^{c0,a0}_{c2,c3} b^{c1,c2}_{a1,a2} c^{c3}_{a3} a+(a1) a+(a2) a+(a3) a-(a0) a-(c1) a-(c0)
-1/4 a^{c0,a0}_{c2,c3} b^{c2,c3}_{a1,a2} c^{c1}_{a3} a+(a1) a+(a2) a+(a3) a-(a0) a-(c1) a-(c0)
+1/2 a^{c0,a2}_{c2,c3} b^{c1,c2}_{a0,a1} c^{c3}_{a3} eta1^{a3}_{a2} a+(a0) a+(a1) a-(c1) a-(c0)
+1/4 a^{c0,a2}_{c2,c3} b^{c2,c3}_{a0,a1} c^{c1}_{a3} eta1^{a3}_{a2} a+(a0) a+(a1) a-(c1) a-(c0)
-a^{c0,a2}_{c2,c3} b^{c1,c2}_{a0,a3} c^{c3}_{a1} eta1^{a3}_{a2} a+(a0) a+(a1) a-(c1) a-(c0)
-1/2 a^{c0,a2}_{c2,c3} b^{c2,c3}_{a0,a3} c^{c1}_{a1} eta1^{a3}_{a2} a+(a0) a+(a1) a-(c1) a-(c0)