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to pack an assortment of goods, etc.
お菓子を箱に詰め合わせる。
Pack an assortment of sweets in a box
果物を詰め合わせてギフトにする。
Put together assorted fruit as a gift
季節の果物をかごに詰め合わせた。
She packed an assortment of seasonal fruits in a basket.