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In those circumstances, the Verwaltungsgericht Berlin (Administrative Court, Berlin) decided to stay the proceedings and to refer the following questions to the Court of Justice for a preliminary ruling: ‘(1) Is there a “production of hydrogen” within the meaning of Annex I, Part 2, to Decision [2011/278], only in the case where a … hydrogen molecule … is produced by chemical synthesis from two H hydrogen atoms, or does the concept of “production” also include the process whereby, in the case of a hydrogenous gas mixture, the relative share of … hydrogen in that mixture is increased — without synthesis — by removal of the other gas components — whether by physical or chemical means — in order to obtain a “product … expressed as saleable (net) production and to 100% purity of the substance concerned” within the meaning of Annex I, Part 2, to Decision [2011/278]? (2) If the answer to Question 1 is that the concept of production does not include the process of increasing the relative share of … hydrogen in a gas mixture, the following further question must be asked: Must the wording “relevant process elements directly or indirectly linked to the production of hydrogen and the separation of hydrogen and carbon monoxide” be interpreted as meaning that only both elements together (“and”) are covered by the system boundaries of the product benchmark for hydrogen described in Annex I, Part 2, to Decision [2011/278] or can the process element “separation of hydrogen and carbon monoxide” also operate in isolation within the system boundaries as an independent process element in its own right? (3) If the answer to Question 2 is that the process element “separation of hydrogen and carbon monoxide” can also operate in isolation within the system boundaries as an independent process element in its own right, the following further question must be asked: Is the process element “separation of hydrogen and carbon monoxide” present only where … hydrogen is separated exclusively from … carbon monoxide, or is the process element “separation of hydrogen and carbon monoxide” also present where that process involves the separation of hydrogen not only from carbon monoxide but also from other substances, such as carbon dioxide …? (4) In the event that [Evonik Degussa] is to be recognised by judicial decision as being entitled to an additional allocation of free emission allowances, must paragraph 3 of the operative part of the judgment of 28 April 2016, Borealis Polyolefine and Others (C‑191/14, C‑192/14, C‑295/14, C‑389/14 and C‑391/14 to C‑393/14, EU:C:2016:311), be interpreted as meaning that: (a) the [correction factor] provided for in Article 4 of, and Annex II to, Decision [2013/448], in its original version, is applicable to allocations for the years 2013-2020 that were established by the competent authority of the Member State before 1 March 2017; and (b) the [correction factor] provided for in Article 4 of, and Annex II to, Decision [2013/448], in its original version, is applicable to additional allocations for the years 2013-2017 that were awarded by judicial decision after 1 March 2017; and (c) the [correction factor] provided for in Article 4 of, and Annex II to, Decision [2013/448], … applicable after 1 March 2017, is applicable to additional allocations for the years 2018-2020 that were awarded by judicial decision after 1 March 2017?’