| http://www.w3.org/ns/prov#value | - bent material selected from the group consisting of:(1) a homopolymer of at least one monomer selected from N-alkyl- or N-alkylene- substituted (meth)acrylamides represented by the following general formula (I) or (II): ##STR3## wherein R1 is a hydrogen atom or methyl group and R2 is a methyl or ethyl group, or ##STR4## wherein R1 is a hydrogen atom or methyl group and A is member selected from th
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