| http://www.w3.org/ns/prov#value | - d: wherein Ph is an aromatic group such as a phenyl group, xb is an integer of at least 2 representing the number of repeating units, y is an integer of at least 1, which may be the same or different among the respective repeating units, and z is 0 or 1, which nay be the same or different in the respective repeating units, wherein Ph is an aromatic group such as a phenyl group, xb is an integer of
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