YOU SAID:

Once upon a time potato

INTO JAPANESE

昔はポテト

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In the past potatoes

INTO JAPANESE

過去のジャガイモ

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Potatoes in the past

INTO JAPANESE

過去にジャガイモ

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In the past it's potatoes

INTO JAPANESE

それはジャガイモの過去

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It's the last potato

INTO JAPANESE

それは最後のジャガイモ

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It's the last potato