21According to the case-law of the Court, it is also important for the referring court to set out the precise reasons why it was unsure as to the interpretation of European Union law and why it considered it necessary to refer questions to the Court for a preliminary ruling (see, to that effect, inter alia, Joined Cases C-453/03, C-11/04, C-12/04 and C-194/04 ABNA and Others [2005] ECR I-10423, paragraph 46 and case-law cited, and the order in Case C-432/10 Chihabi and Others [2011], paragraph 22).
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