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Examples of suitable materials are cellulose, cellulose hydrate, cellulose acetate, various cellulose esters, polycarbonate membranes of the type disclosed in U.S. Pat. Nos. 4,075,108 and 4,160,791 to Higley et al., poly(vinyl alcohol) membranes of the type described in U.S. Pat. No. 4,073,733 to Yamauchi et al., microporous poly(ethylene) and poly(propylene) films, cross linked alginate (a non-to
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