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each house; every house
「戸戸」 has another reading with different meanings.
戸戸に配り物をした。
I delivered items to each house.
戸戸の玄関先に花が飾ってあった。
Flowers were displayed at each house's entrance.
戸戸を回って住民の意見を集めるのに一日掛かった。
It took a whole day to visit each house and collect residents' opinions.