1/24 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,a7} eta1^{a7}_{a3} eta1^{a6}_{a2} eta1^{a5}_{a1} eta1^{a4}_{a0}
+1/8 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,a7} eta1^{a7}_{a3} eta1^{a6}_{a2} lambda2^{a4,a5}_{a0,a1}
-1/36 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,a7} eta1^{a7}_{a3} lambda3^{a4,a5,a6}_{a0,a1,a2}
+1/32 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,a7} lambda2^{a6,a7}_{a2,a3} lambda2^{a4,a5}_{a0,a1}
+1/576 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,a7} lambda4^{a4,a5,a6,a7}_{a0,a1,a2,a3}
-1/36 a^{a0,a1,a2,a6}_{} b^{}_{a3,a4,a5,a7} eta1^{a7}_{a6} a+(a3) a+(a4) a+(a5) a-(a2) a-(a1) a-(a0)
+1/8 a^{a0,a1,a4,a5}_{} b^{}_{a2,a3,a6,a7} eta1^{a7}_{a5} eta1^{a6}_{a4} a+(a2) a+(a3) a-(a1) a-(a0)
+1/16 a^{a0,a1,a4,a5}_{} b^{}_{a2,a3,a6,a7} lambda2^{a6,a7}_{a4,a5} a+(a2) a+(a3) a-(a1) a-(a0)
-1/6 a^{a0,a2,a3,a4}_{} b^{}_{a1,a5,a6,a7} eta1^{a7}_{a4} eta1^{a6}_{a3} eta1^{a5}_{a2} a+(a1) a-(a0)
-1/4 a^{a0,a2,a3,a4}_{} b^{}_{a1,a5,a6,a7} eta1^{a7}_{a4} lambda2^{a5,a6}_{a2,a3} a+(a1) a-(a0)
+1/36 a^{a0,a2,a3,a4}_{} b^{}_{a1,a5,a6,a7} lambda3^{a5,a6,a7}_{a2,a3,a4} a+(a1) a-(a0)