YOU SAID:

i promise i'll do better

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私はもっとうまくやると約束する

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I promise I will do better

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私はもっとうまくいくと約束します

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I promise it will work better

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私はそれがうまくいくと約束します

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I promise it will work

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私はそれがうまくいくと約束します

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I promise it will work