| http://www.w3.org/ns/prov#value | - wherein each R2 is independently a C1-13 monovalent organic group, each Ar is independently a C6-36 arylene group wherein the bonds are directly connected to an aromatic moiety, each R3 is independently a divalent C1-30 organic group, and E is an integer having an average value of 2 to 1,000.
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