In a heavy saucepan, combine dry pudding mix, sugar, milk and butter. Bring to a boil; boil and stir until a candy thermometer reads 224°, about 3 minutes. Remove from the heat and beat rapidly for 1 minute. Add pecans; continue beating until mixture thickens slightly. Drop by tablespoonfuls onto waxed paper-lined baking sheets. Refrigerate until firm, about 45 minutes.
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