Wǔ jīng Qī Shū
Seven Military Classics of ancient China viz "Six Secret Strategic Teachings” 六韜|六韬[Lìu Tāo], “Methods of Sima” 司馬法|司马法[Sī mǎ Fǎ], ”Art of War” 孫子兵法|孙子兵法[Sūn zǐ Bīng Fǎ], “Wu-zi” 吳子|吴子[Wú zǐ], “Wei Liao-zi” 尉繚子|尉缭子[Wèi Liáo zi], ”Three Strategies of Huang Shigong” 黃石公三略|黄石公三略[Huáng Shí gōng Sān Lüè] and ”Duke Li of Wei answering Emperor Taizong of Tang” 唐太宗李衛公問對|唐太宗李卫公问对[Táng Tài zōng Lǐ Wèi Gōng Wèn Dùi]
chén gǔ zi làn zhī ma
lit. stale grain, overcooked sesame (idiom); fig. the same boring old gossip