18It is settled case-law of the Court that provisions which are in the nature of exceptions to a principle must be interpreted strictly (see, inter alia, Case C-399/93 Oude Luttikhuis and Others [1995] ECR I-4515, paragraph 23; Case C-83/99 Commission v Spain [2001] ECR I-445, paragraph 19; and Case C-41/09 Commission v Netherlands [2011] ECR I-831, paragraph 58).
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