What are the unchangeable words?

stick to the rules and stick to the rules. Xiao Cao followed

stick to the rules [mò shǒu chéng guī]

Basic definition

stick to the rules: Mo Zhai was good at guarding the city during the Warring States Period; Rules: ready-made or long-established rules and methods. Refers to conservative thinking, sticking to old rules and refusing to change.

derogatory