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Jam is a type of fruit preserves. Jam may also refer to: ==Forms of obstruction== * Traffic congestion or traffic jam * Firearm malfunction, failure of a firearm to function properly 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jam (disambiguation)」の詳細全文を読む スポンサード リンク
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