He couldn't remember exactly where he had read it

La salle des coffres d’une prestigieuse banque… De nombreuses portes renfermant sans doute des trésors… Arriveras tu à tout ouvrir ?

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He couldn't remember exactly where he had read it, but he was sure that he had. The fact that she didn't believe him was quite frustrating as he began to search the Internet to find the article. It wasn't as if it was something that seemed impossible. Yet she insisted on always seeing the source whenever he stated a fact.