-1/288 a^{a2,a6}_{a0,a1} b^{}_{c0,c1,c2,c3} c^{}_{a3,a4,a5,a7} eta1^{a7}_{a6} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a+(a1) a+(a3) a+(a4) a+(a5) a-(a2)
+1/192 a^{a4,a5}_{a0,a1} 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+(a1) a+(a2) a+(a3)
+1/384 a^{a4,a5}_{a0,a1} 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+(a1) a+(a2) a+(a3)
-1/288 a^{a5,a6}_{a0,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+(a0) a+(a1) a+(a2) a+(a3)