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| - One class of osmotic agents water-swellable hydrophilic polymers, which are also referred to as ???osmopolymers??? and ???hydrogels,??? including, but not limited to, hydrophilic vinyl and acrylic polymers, polysaccharides such as calcium alginate, polyethylene oxide (PEO), polyethylene glycol (PEG), polypropylene glycol (PPG), poly(2-hydroxyethyl methacrylate), poly(acrylic) acid, poly(methacryli
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