Final report of the Hearing Officer in Case COMP/M.3056 — Celanese/Degussa/JV (European oxo Chemicals) (pursuant to Article 15 of Commission Decision 2001/462/EC, ECSC of 23 May 2001 on the terms of reference of Hearing Officers in certain competition proceedings (OJ L 162, 19.6.2001, p. 21)) (Text with EEA relevance)