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nouns which may take the genitive case particle 'no', adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
(very) cheap, (very) inexpensive, cut-price, bargain (price)
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何日前までに予約すれば格安料金の対象になりますか。
How early do I have to make a reservation to qualify for the discount?
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