-1/288 a^{a1,a2,a6}_{a0} b^{}_{c0,c1,c2,c3} c^{}_{a3,a4,a5,a7} eta1^{a7}_{a6} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a3) a+(a4) a+(a5) a-(a2) a-(a1)
+1/96 a^{a1,a4,a5}_{a0} b^{}_{c0,c1,c2,c3} c^{}_{a2,a3,a6,a7} eta1^{a7}_{a5} eta1^{a6}_{a4} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a2) a+(a3) a-(a1)
+1/192 a^{a1,a4,a5}_{a0} b^{}_{c0,c1,c2,c3} c^{}_{a2,a3,a6,a7} lambda2^{a6,a7}_{a4,a5} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a2) a+(a3) a-(a1)
-1/144 a^{a2,a3,a4}_{a0} b^{}_{c0,c1,c2,c3} c^{}_{a1,a5,a6,a7} eta1^{a7}_{a4} eta1^{a6}_{a3} eta1^{a5}_{a2} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1)
-1/96 a^{a2,a3,a4}_{a0} b^{}_{c0,c1,c2,c3} c^{}_{a1,a5,a6,a7} eta1^{a7}_{a4} lambda2^{a5,a6}_{a2,a3} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1)
+1/864 a^{a2,a3,a4}_{a0} b^{}_{c0,c1,c2,c3} c^{}_{a1,a5,a6,a7} lambda3^{a5,a6,a7}_{a2,a3,a4} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1)
-1/96 a^{a3,a4,a5}_{a2} b^{}_{c0,c1,c2,c3} c^{}_{a0,a1,a6,a7} eta1^{a7}_{a5} lambda2^{a2,a6}_{a3,a4} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1)
+1/576 a^{a3,a4,a5}_{a2} b^{}_{c0,c1,c2,c3} c^{}_{a0,a1,a6,a7} lambda3^{a2,a6,a7}_{a3,a4,a5} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1)
-1/288 a^{a0,a5,a6}_{a4} b^{}_{c0,c1,c2,c3} c^{}_{a1,a2,a3,a7} lambda2^{a4,a7}_{a5,a6} a+(c0) a+(c1) a+(c2) a+(c3) a+(a1) a+(a2) a+(a3) a-(a0)