20The Commission recognises that there is no precedent in this area. It relies, however, in support of its argument, on the case-law of the Court concerning the duty of loyal cooperation and the principles of effectiveness and equivalence (see, inter alia, Case 50/76 Amsterdam Bulb [1977] ECR 137, paragraph 33, Case C-186/98 Nunes and de Matos [1999] ECR I-4883, paragraphs 12 and 14, and the order of 13 July 1990 in Case C-2/88 IMM Zwartveld and Others [1990] ECR I-3365, paragraph 17).
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