甲乙丙丁 [－－－－]

Jyutping gaap3 jyut3 bing2 ding1
Pinyin jiǎ yǐ bǐng dīng

Definitions (Wiktionary)
  1. phrase, idiomatic
    jia, yi, bing and ding (the first four heavenly stems)
  2. phrase, figuratively, idiomatic
    sequence or outline of a matter