1/48 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c3} c^{c2,c3}_{a4,a5} a+(c0) a+(c1) a+(a0) a+(a1) a+(a2) a+(a4) a+(a5) a-(a3)
+1/72 a^{a3}_{a0,a1,a2} b^{}_{c0,c1,c2,c4} c^{c3,c4}_{a4,a5} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a+(a2) a+(a4) a+(a5) a-(a3) a-(c3)
-1/24 a^{a4}_{a0,a1,a2} b^{}_{c0,c1,c2,c3} c^{c2,c3}_{a3,a5} eta1^{a5}_{a4} a+(c0) a+(c1) a+(a0) a+(a1) a+(a2) a+(a3)
-1/288 a^{a4}_{a0,a1,a2} b^{}_{c0,c1,c2,c3} c^{c4,c5}_{a3,a5} eta1^{a5}_{a4} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1) a+(a2) a+(a3) a-(c5) a-(c4)
-1/36 a^{a4}_{a0,a1,a2} b^{}_{c0,c1,c2,c4} c^{c3,c4}_{a3,a5} eta1^{a5}_{a4} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a+(a2) a+(a3) a-(c3)