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Jyutping dung1 dong2 dung6 duk1 tung4 dong2 dung6 duk6
Pinyin dōng dǎng dòng dū tóng dǎng dòng dú

Definitions (Wiktionary)
  1. phrase, Min-Nan
    A meaningless phrase used to memorise tones in Min Nan.