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carbon atoms, and an oxoalkyl group having 4 to 20 carbon atoms, specifically the same as RL $^{04 }$and the like are exempli› fied. 

Specifically, a repeating unit represented by the above- mentioned general formula (6) is exemplified by the follow- ing, but is not limited thereto. Although only a (meth)acrylic acid ester is shown, the one intervened by a divalent connector represented by the foregoing formula (L-2) or (L-2-2) may also be used. 

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