72Moreover, in so far as it allows a derogation from the principle of non-discrimination, Article 4(1) of the Directive must be interpreted strictly (see, by analogy, in relation to discrimination on grounds of sex, Case 222/84 Johnston [1986] ECR 1651, paragraph 36 and Case C-273/97 Sirdar [1999] ECR I-7403, paragraph 23, as well as, in relation to Article 2(5) of the Directive, to that effect, Petersen, paragraph 60).
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