33Consequently, national courts and tribunals, in collaboration with the Court of Justice, fulfil a duty entrusted to them jointly of ensuring that in the interpretation and application of the Treaties the law is observed (see, to that effect, Opinion 1/09 (Agreement creating a Unified Patent Litigation System), of 8 March 2011, EU:C:2011:123, paragraph 69, and judgment of 3 October 2013, Inuit Tapiriit Kanatami and Others v Parliament and Council, C‑583/11 P, EU:C:2013:625, paragraph 99).
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