35In the first place, it must be accepted that the particularly sensitive and essential nature of the interests protected by Article 4(1)(a) of Regulation No 1049/2001, combined with the fact that access must be refused by the institution, under that provision, if disclosure of a document to the public would undermine those interests, confers on the decision which must thus be adopted by the institution a complex and delicate nature which calls for the exercise of particular care. Such a decision requires, therefore, a margin of appreciation.
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