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