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A plan for NYSE Group Inc. and NASD to form a single regulator for U.S. brokerages should be blocked by a judge because it unfairly favors Wall Street’s biggest firms, Tustin-based Standard Investment Chartered Inc. said in a suit filed Thursday in New York. The suit is a signal that small brokerages, concerned the combination would diminish their clout, haven’t given up their opposition, even though NASD members in January voted 65% in favor of letting the Washington-based watchdog join with NYSE’s regulatory arm to form a single entity.