1/36 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c3} c^{c1,c2,c3}_{a4} a+(c0) a+(a0) a+(a1) a+(a2) a+(a4) a-(a3)
-1/36 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c3} c^{c1,c2,c3}_{a4} eta1^{a4}_{a3} a+(c0) a+(a0) a+(a1) a+(a2)
+1/864 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c3} c^{c4,c5,c6}_{a4} eta1^{a4}_{a3} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1) a+(a2) a-(c6) a-(c5) a-(c4)
+1/72 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c5} c^{c3,c4,c5}_{a4} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a+(a2) a+(a4) a-(a3) a-(c4) a-(c3)
-1/72 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c5} c^{c3,c4,c5}_{a4} eta1^{a4}_{a3} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a+(a2) a-(c4) a-(c3)
-1/24 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c3,c4} c^{c2,c3,c4}_{a4} a+(c0) a+(c1) a+(a0) a+(a1) a+(a2) a+(a4) a-(a3) a-(c2)
+1/24 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c3,c4} c^{c2,c3,c4}_{a4} eta1^{a4}_{a3} a+(c0) a+(c1) a+(a0) a+(a1) a+(a2) a-(c2)