| http://www.w3.org/ns/prov#value | - Compositions, for example, in forms other than ophthalmic lenses, which comprise a water swellable, first polymer material, preferably a first cross-linked polymer material, and a second material, other than the first material and polyacrylic acid, selected from water soluble polymeric materials, water swellable polymeric materials and mixtures thereof immobilized preferably physically immobilized
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