1/2 a^{c2,a1}_{c0,c1} b^{c3}_{c5} c^{c5,a0}_{c4,a2} eta1^{a2}_{a1} a+(c0) a+(c1) a+(c4) a-(a0) a-(c3) a-(c2)
+a^{c1,a0}_{c0,c3} b^{c3}_{c4} c^{c4,a2}_{c2,a1} a+(c0) a+(c2) a+(a1) a-(a2) a-(a0) a-(c1)
+a^{c1,a1}_{c0,c3} b^{c3}_{c4} c^{c4,a0}_{c2,a2} eta1^{a2}_{a1} a+(c0) a+(c2) a-(a0) a-(c1)
-a^{c1,a1}_{c0,c5} b^{c3}_{c2} c^{c5,a0}_{c4,a2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(c4) a-(a0) a-(c3) a-(c1)
+a^{c1,a1}_{c0,c5} b^{c5}_{c2} c^{c4,a0}_{c3,a2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(c3) a-(a0) a-(c4) a-(c1)
+a^{c0,a0}_{c3,c4} b^{c3}_{c1} c^{c4,a2}_{c2,a1} a+(c1) a+(c2) a+(a1) a-(a2) a-(a0) a-(c0)
+a^{c0,a1}_{c3,c4} b^{c3}_{c1} c^{c4,a0}_{c2,a2} eta1^{a2}_{a1} a+(c1) a+(c2) a-(a0) a-(c0)