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