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0, <jats:italic>\u03b1<\/jats:italic> \u2208 (0,1), and all <jats:italic>a<\/jats:italic>, <jats:italic>b<\/jats:italic> &gt; 0 with <jats:italic>a<\/jats:italic> \u2260 <jats:italic>b<\/jats:italic>. 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