YOU SAID:

so fun if mom mom mom what will dumb lunch

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お母さんお母さんお母さん、お弁当は何だろう

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Mom mom mom, what's your lunch

INTO JAPANESE

お母さんお母さんお母さん、お弁当は？

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Mom mom mom, what about your lunch?

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お母さんお母さんお昼はどう？

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Mom mom how about lunch?

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お母さんお母さんランチはどう？

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Mom mom how about lunch?