| http://www.w3.org/ns/prov#value | - The polymerization method of a first step and the polymerization method of a second step or later steps may be the same or different, and preferably, from the standpoints of polymerization activity and easiness of post-treatment, the first step is a step in which polymerization is conducted in the absence of an inert solvent and the second or later steps are a step in which polymerization is condu
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