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Jyutping bat1 sing4 man4 faat3
Pinyin bù chéng wén fǎ

Definitions (CC-CEDICT)
  1. unwritten law
Definitions (Wiktionary)
  1. noun
    unwritten law
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)