150It must be held that the single, very short, sentence cited in paragraph 148 above is not an exhaustive definition of the circumstances in which two transactions constitute a single concentration. It should be noted in that regard that whilst a recital of a regulation may cast light on the interpretation to be given to a legal rule, it cannot in itself constitute such a rule (see judgment of 11 June 2009, X, C‑429/07, EU:C:2009:359, paragraph 31 and the case-law cited). The preamble to an EU act has no binding legal force (see judgment of 19 June 2014, Karen Millen Fashions, C‑345/13, EU:C:2014:2013, paragraph 31 and the case-law cited).