1/2 a^{a0,a1}_{c0,c5} b^{c1}_{a2} c^{c4,c5}_{c2,c3} eta1^{a2}_{a1} a+(c0) a+(c2) a+(c3) a-(a0) a-(c4) a-(c1)
+1/4 a^{a0,a1}_{c0,c5} b^{c5}_{a2} c^{c3,c4}_{c1,c2} eta1^{a2}_{a1} a+(c0) a+(c1) a+(c2) a-(a0) a-(c4) a-(c3)
+1/8 a^{a0,a1}_{c3,c4} b^{c0}_{a2} c^{c3,c4}_{c1,c2} a+(c1) a+(c2) a+(a2) a-(a1) a-(a0) a-(c0)
-1/4 a^{a0,a1}_{c3,c4} b^{c0}_{a2} c^{c3,c4}_{c1,c2} eta1^{a2}_{a1} a+(c1) a+(c2) a-(a0) a-(c0)
-1/4 a^{a0,a1}_{c3,c4} b^{c3}_{a2} c^{c2,c4}_{c0,c1} a+(c0) a+(c1) a+(a2) a-(a1) a-(a0) a-(c2)
+1/2 a^{a0,a1}_{c3,c4} b^{c3}_{a2} c^{c2,c4}_{c0,c1} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0) a-(c2)