| http://www.w3.org/ns/prov#value | - description in the patent in suit, in particular page 2, lines 51/52 and page 6, lines 16 to 31, the technical problem underlying the patent in suit with respect to D2 may be seen as the provision of a method for the preparation of a Ziegler-Natta catalyst composition having (i) both a high activity and capability of producing a polymer with a high stereospecificity and (ii) the catalyst system i
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