29The determination and formulation of the questions to be put to the Court devolves upon the national court alone and the parties to the main proceedings may not change their tenor (Joined Cases C-42/10, C-45/10 and C-57/10 Vlaamse Dierenartsenvereniging and Janssens [2011] ECR I-2975, paragraph 43, and Case C-316/10 Danske Svineproducenter [2011] ECR I-13721, paragraph 32).
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