111The first stage, envisaged in the provision’s first sentence, requires the Member States to carry out an appropriate assessment of the implications for a protected site of a plan or project when there is a likelihood that the plan or project will have a significant effect on that site (judgments of 11 April 2013, Sweetman and Others, C‑258/11, EU:C:2013:220, paragraph 29, and of 21 July 2016, Orleans and Others, C‑387/15 and C‑388/15, EU:C:2016:583, paragraph 44).
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