17Since the legal basis of an act determines the procedure to be followed for its adoption (judgments in Parliament v Council, C‑130/10, EU:C:2012:472, paragraph 80, and Parliament v Council, C‑658/11, EU:C:2014:2025, paragraph 57), the second and third pleas in law should be examined first: the choice of a repealed or invalid legal basis, and the choice of a legal basis relating to implementing measures for the adoption of a legislative decision.
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