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ダイレクトマーケティングの略語だが、意味は違う、という理解
ややこし。。。
ダイマ - Google 検索 https://www.google.co.jp/search?q=%E3%83%80%E3%82%A4%E3%83%9E&ie=UTF-8&oe=UTF-8&hl=ja-jp&client=safari