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Jyutping jat1 zi6 gam3 cin2
Pinyin yī zì gàn qiǎn

Definitions (Wiktionary)
  1. adj, Cantonese
    very simple and apparent; easy as 123; easy as ABC

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Jyutping jat1 zi6 gam3 cin2
Pinyin yī zì hán qiǎn

Definitions (粵典–words.hk)
  1. 形容詞
    好似​寫​「​一​」​字​咁​簡單
    extremely simple; as easy as ABC; literally: as easy as the character "one"
    • 條問題有幾難啫?一字咁淺啦。
      条问题有几难啫?一字咁浅啦。
      tiu4 man6 tai4 jau5 gei2 naan4 ze1? jat1 zi1 gam3 cin2 laa1.
      How hard is the question? It's as easy as ABC.
Definitions (Kaifangcidian)
  1. 淺顯易懂 – 浅显易懂
  2. 極其淺顯 – 极其浅显
  3. 非常容易

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Jyutping jat1 zi6 gam3 cin2
Pinyin yī1zi gān qián

Definitions (CC-CANTO)
  1. as easy as ABC and 123 [colloquial]

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Jyutping jat1 zi6 gam2 cin2
Pinyin yī zì gān qiǎn

Definitions (CC-CANTO)
  1. as simple as the word "one"
Examples (粵典–words.hk)
  1. Cantonese
    条问题有几难啫?一字咁浅啦。
    條問題有幾難啫?一字咁淺啦。
    tiu4 man6 tai4 jau5 gei2 naan4 ze1? jat1 zi1 gam3 cin2 laa1.
    • How hard is the question? It's as easy as ABC.