50It must be borne in mind that the Commission is required to initiate the formal investigation procedure if, following the preliminary examination referred to in Article 4 of Regulation 2015/1589, it was unable to satisfy itself that the notified measure is compatible with the internal market. The same applies where the Commission entertains doubts as to the actual classification as ‘aid’, within the meaning of Article 107(1) TFEU of that measure (see, to that effect, inter alia, judgments of 10 May 2005, Italy v Commission, C‑400/99, EU:C:2005:275, paragraph 47; of 21 July 2011, Alcoa Trasformazioni v Commission, C‑194/09 P, EU:C:2011:497, paragraph 60; and of 24 January 2013, 3F v Commission, C‑646/11 P, not published, EU:C:2013:36, paragraph 27).
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