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Stocks edged slightly higher in a quiet day for investors who had little economic data or company earnings to react to. Analysts think the market will stay in a holding pattern until traders hear from new Federal Reserve chair Janet Yellen in her first testimony before Congress Tuesday and Wednesday. The tech-heavy Nasdaq rose on Apple’s $9.31 gain after activist investor Carl Icahn lightened up on his effort to force Apple to increase its stock buybacks. Apple last week said it had bought $14 billion of its own stock. Among gainers, Pawtucket, R.I., toymaker Hasbro rose nearly 5 percent on a dividend boost and a bright outlook for 2014.